Rolex Day-Date: The Most Detailed Authentication Guide

Written by
Ch Alex
how to spot fake rolex day-date

Last Updated on October 8, 2025 by Ch David


How to authenticate a Rolex Day-Date? It’s a challenge that deserves careful attention.

Known as the “President’s Watch,” the Day-Date carries a prestige that very few other Rolex models can match. Since its introduction in 1956, it has remained a symbol of success, thanks to its distinctive day-of-the-week display and precious-metal construction.

Because of its status and price point, the Day-Date is one of the most counterfeited luxury watches on the market. Replicas vary in quality, but even convincing ones struggle to reproduce the precise fonts, finishing, and materials that define the genuine article.

For collectors, the risk is clear: without proper authentication, a watch worth tens of thousands can turn out to be a costly mistake.

This guide walks you through the essential checks for verifying a Rolex Day-Date, from dial inscriptions to bracelet details, so you can approach your purchase or collection with confidence.

Rolex Day-Date • President’s Watch Certificate of Authenticity available Human experts since 2017

Turn uncertainty into leverage.

Before you move tens of thousands, get proof you can use, not just reassurance.

Protect your money: We verify 18k metal, weight, dimensions and alignment so you don’t buy an expensive mistake.
Win the negotiation: If something’s off, our notes give you the facts to renegotiate or walk away confidently.
Proof that pays back: Add a Certificate of Authenticity for resale, insurance and dispute protection.
Clarity fast: 100% human review with clear, plain-English findings. Zero guesswork, no AI.
Verify my Day-Date now

Discreet. Expert-led. Built to protect your purchase and strengthen your position.

How To Authenticate a Rolex Day-Date

Answer: An effective way to begin authenticating a Rolex Day-Date is to examine the weekday display at 12 o’clock.

On an authentic model, the letters are cleanly engraved, evenly spaced, and perfectly aligned within the window. Counterfeits often reveal themselves here, with text that looks too thick, uneven, or poorly centered.

Since the day display is a defining feature of the Day-Date, errors in this area are a strong indicator of a fake.

Still, this is only the first step…

A thorough authentication should also cover the case engravings, bracelet construction, and overall weight, which we explore in detail below.

1. Weekday inscription

  • Authentic: The “MONDAY” (or any weekday) is evenly balanced within the arched window, with thin, sharp typography and consistent kerning across letters.
  • Fake: The weekday text often looks oversized, stretching closer to the left and right edges of the frame. The font is too thick, and the spacing between letters is irregular, especially around the “A,” which often shows excess weight in the top-right corner.
Authentic vs fake Rolex Day-Date comparison of the weekday's text on the dial

On a genuine Rolex Day-Date, the weekday disc is one of the cleanest visual cues.

The brand uses perfectly cut wheels and precision printing, ensuring the letters always sit harmoniously within the curved window. When viewed under a loupe, the strokes are uniform, with no ink bleeding or irregular spacing.

Replicas often exaggerate letter thickness because of lower-quality printing. The result is bolder text, uneven kerning, and, in poor counterfeits, varying gaps between letters.

A quick loupe inspection of the weekday disc can often expose these flaws within seconds.


Want the expert's opinion? Let our Rolex authenticators check your watch:

2. Date placement

  • Authentic: The numbers are centred inside the square aperture, equidistant from both left and right edges, and aligned horizontally.
  • Fake: Numbers tend to drift. For example, “17” sitting too far left with extra space on the right. Crooked placement is also common, where the digits appear angled instead of straight.
Authentic vs fake Rolex Day-Date comparison of the date's placement on the dial

The alignment of the date wheel is another area where Rolex’s manufacturing standards shine.

The brand’s date discs are designed to drop into the window in perfect symmetry, regardless of the number displayed.

Counterfeiters rarely match this precision. Misplaced numerals and crooked printing are frequent, often because of cheaper date wheel mechanisms or poorly calibrated components.

When authenticating, pay attention not only to centring but also to whether the numbers appear straight.

Even the smallest tilt can signal a replica.

The same date alignment principles apply to the Rolex Datejust authentication guide.

Want to see this date window test in action?

In just 30 seconds, this short shows why collectors never skip checking the date on a Rolex.

Watch the short

3. Date thickness

  • Authentic: Numbers are thin, sharp, and evenly placed in the centre of the window. For example, the “2” has clean edges and sits straight.
  • Fake: Printing often appears too thick, giving the numerals a heavier look. Placement is also off, with the “2” frequently shifted to the left, leaving an uneven gap.
Authentic vs fake Rolex Day-Date comparison of the date number's thickness

Rolex pays close attention to typography, ensuring that every number is consistent in both weight and alignment.

On a genuine Day-Date, numerals are neither bold nor faint, and spacing within the aperture is symmetrical.

Replicas, however, tend to use cheaper printing techniques. Thickened numbers, crooked positioning, or off-centre alignment are clear red flags.

If the font looks heavy-handed or unbalanced, you’re most likely handling a fake.

4. Rehaut engravings

  • Authentic: The rehaut (inner ring between the dial and crystal) carries “ROLEX” engravings and the serial number. Each engraving lines up perfectly with the minute markers.
  • Fake: Engravings are often misaligned, sitting slightly off from the corresponding markers. The text may also appear inconsistent in depth and positioning.
Authentic vs fake Rolex Day-Date comparison of the rehaut

The rehaut is one of Rolex’s hallmark precision zones.

On authentic Day-Dates, engravings are laser-etched with remarkable consistency, aligned down to the smallest fraction with each minute marker.

This detail is virtually impossible to get wrong in genuine production.

Fakes, however, routinely fail here. Even high-grade replicas often show rehaut text that doesn’t match the markers precisely, sometimes being slightly too high, too low, or uneven in spacing.

When inspecting, use a loupe and line up the “ROLEX” text against the dial’s minute marks.

Any misalignment is a strong indicator of a counterfeit.

Collectors often compare this with the Submariner Hulk guide, where rehaut flaws are just as revealing.

A quick mention:

  • The steps we’ve written so far are the BEST ways to authenticate this item
  • The next few steps are still reliable methods…
  • … but they apply to non-top-versions of replicas available for this item

If in doubt, we recommend double-checking the steps we’ve explained above this line.

5. Clasp engravings

  • Authentic: The “ROLEX” text on the clasp is thin, even, and shallowly engraved. “GENEVA” appears with consistent letter sizing, and the “SWISS MADE” line has uniform font weight across all letters.
  • Fake: The “ROLEX” engraving is often too thick due to deeper cuts. In “GENEVA,” the “N” and “V” are undersized and thinner than the surrounding letters. In “SWISS MADE,” the three “S” characters are oversized, while the “W” and “I” look too thin. “D” and “E” in “MADE” appear thicker and larger than “M” and “A.”
Authentic vs fake Rolex Day-Date comparison of the clasp

Rolex’s clasp engravings are a showcase of balance.

Every line and curve has a consistent weight, achieved through high-precision machinery. Nothing is overemphasized, and all characters harmonize in size and depth.

Counterfeits often lack this refinement. Misbalanced letters, variable font weights, or oversized characters are obvious signs of poor engraving.

A jeweler’s loupe makes spotting these issues far easier, and clasp inspection is one of the most revealing checks you can perform.

Relevant reads: See our Rolex Daytona guide for another example of how engravings expose counterfeits. Or, check out this Rolex authentication guide that works for the most popular Rolex models.

6. Weight

  • Authentic: A genuine Rolex Day-Date with the President bracelet weighs around 215 grams (0.47 lb).
  • Fake: Most replicas weigh less, though some poorly made fakes try to compensate by being too heavy.

Weight is one of the most objective tests for this model.

Rolex uses 18-karat gold and precise case construction, giving the watch a substantial yet well-balanced heft. When worn, the Day-Date feels firm but never clunky, with the bracelet evenly distributing weight across the wrist.

Replicas usually fall short. They may feel unusually light due to inferior steel or hollow parts, or artificially heavy when cheap materials are packed into the case.

If you weigh the watch and the reading is far from the reference spec, it’s a strong red flag.

Always weigh with the bracelet attached and consider any removed links before making a judgment.

7. Materials

  • Authentic: Rolex Day-Date models are crafted from 18-karat gold (yellow, white, or Everose).
  • Fake: Replicas are almost always made of stainless steel with gold-colored plating. Genuine gold replicas are extremely rare.

The use of solid gold is one of the defining traits of the Day-Date.

It gives the watch its signature presence and value, and it’s something counterfeiters rarely attempt to reproduce due to cost.

If you’re uncertain, any competent jeweler can test the metal.

A genuine piece will always verify as 18k gold, while fakes will reveal stainless steel underneath.

This step alone can separate an authentic Day-Date from nearly every replica on the market.

Luxury watches like the Day-Date and Patek share the same solid gold standards. Our Patek Philippe guide explains why.

8. Case dimensions

  • Authentic: Case diameter should measure exactly 40 mm (1.57 in).
  • Fake: Replicas often come in at the wrong size, either slightly smaller or larger.

Case measurements are an underrated but highly reliable check.

Rolex is exacting in its standards, and all modern Day-Date models share the same 40 mm profile. Using a digital or vernier caliper, you should consistently get this reading on an authentic watch.

Fakes frequently miss the mark. Even a 1 mm difference is a red flag, especially when combined with other signs like weight or dial flaws.

For collectors, case measurement is one of the quickest and most reliable physical checks you can perform.

For another flagship luxury watch, see our Audemars Piguet guide.

Short On Time? Authenticate Your Rolex Day-Date in 30 Seconds

Here’s the short version for collectors who want the essentials. These are the fastest checks that reveal whether a Day-Date is genuine or counterfeit.

  1. Weekday inscription → Letters sharp, evenly spaced, centred in the arch, not oversized or irregular.
  2. Date placement → Numbers sit straight and centred, never drifting left or right.
  3. Date thickness → Numerals thin and crisp, not heavy or crooked.
  4. Rehaut engravings → “ROLEX” text and serial align perfectly with markers, no drifting or shallow cuts.
  5. Clasp engravings → Even, shallow lettering with consistent font weight, no oversized or mismatched letters.
  6. Weight → Around 215 g with bracelet, balanced on the wrist, not unusually light or clunky.
  7. Materials → Always solid 18k gold (yellow, white, or Everose), not plated steel.
  8. Case dimensions → Measures exactly 40 mm, not smaller or larger.

These quick checks expose most replicas, but for certainty, always cross-check with reference images or have the watch examined by a professional authenticator.

Check out our hub to see all our guides.

Video: Quick Authenticity Checks for the Rolex Day-Date

If you want a fast visual reference for the Day-Date 228235, I recorded this walkthrough comparing a genuine Everose example to a budget replica.

It is built for meet-ups and quick authenticity-checks, so you can focus on the weekday window, date alignment, rehaut engravings, movement, materials, and the rest before a full inspection.

👉 Click here to show the video’s transcript (1-min read)

Guess which is the authentic watch

right here we have both the 50k usd genuine watch and the chip replica that costs around 600 usd i am challenging you to pause this video and guess which of the two watches is the genuine one and why leave us a comment with your answer and please don’t cheat

Intro

hello and welcome thank you for watching this new video guide created by legitcheck by ch

kindly like this video subscribe to our channel and turn on the notifications so you will be updated whenever we post new content i would also like to ask you to leave us a comment with any suggestions or questions that you might have my name is ch alex and together with our team at legitcheck by ch we’ll present you today the video guide on an awesome watch one of the few rolexes that we didn’t cover in our video guides until now the extremely famous and sought after rolex day-date real vs fake this gorgeous watch has also been known as the president’s watch but more about this on a future video where we will analyze the watch in detail today we will compare the genuine watch with one of the best replicas and let you know what to look after in order not to get scammed please make sure you take a look at some of our other video guides as we covered other watch models and brands and don’t forget to subscribe so you will get updated each time a new video guide is made public now getting back to our rolex day date

the reference number that we have here today for both the genuine and the replica watches is the rolex day-date 228235 that has an olive green dial the genuine watch is equipped with a rolex caliber 3235 movement and is made out of rose gold marketed by rolex’s the ever rose gold the replica watch on the other hand has a gold plating and a totally different movement we will highlight these differences in today’s video

another very interesting difference between the two watches has to do with their prices the genuine rolex day-date has a retail price of more than 40k us dollars but you have to be ultra lucky to get it at this price the same watch is available on the gray market with prices starting from 53 55k usd the replica watch however is a super cheap one in comparison with the genuine item its price is around 600 us dollars but in our opinion difference between the two items is huge not only in terms of their price both the genuine watch present in the video as well as this replica were not brand new the written guide for the rolex day-date is available for free on our website www.legitcheck.app where you can also get your watch authenticated more about this service can be found under the authentication service link on our website

now let me give you a quick rundown on today’s video guide

Rundown of the entire video

for the first step we are going to check the weekday window of the watch

the second step we are going to inspect the date window

step three together we will take a very close look at the dial we will analyze all its elements and focus on the re-hot engravings

the clasp engravings are different on the replica watch and we will highlight this for step number four

for the fifth step we will take a look at the differences between the two watches weight

step number six is about the materials being used to manufacture the genuine and the replica watch

we will open the case back this time and take a close look at the two watches movements and designs for the seventh step

for step number eight we are going to check the full package that comes with the genuine watch

Tell #1 – Weekday Window

weekday window

the rolex day-date as its name says offers a day and date window the day window is available on the dial in place of the 12 o’clock hour marker while the date window is available instead of the 3 o’clock hour marker when closely inspecting the day window we will notice that the font and thickness are different with the replica watch having a lighter phone for the letters representing the day the placement is also different with the replica watches letters almost touching the borders of the window

while the letters on the genuine rolex data it are nicely centered in the window with some very little space remaining on the sides please see for yourself using the images on screen

Tell #2 – Date Window

date window

further inspecting the date window on the rolex day date we do notice major flaws and differences here as well when closely inspecting the numbers in the date window you can notice that the genuine watch has a much bolder font in comparison with the replica watch it is also clearly different that the authentic rolex data perfectly centers its numbers in the date window while the replica watch has a totally imperfect centering of its numbers in the window

Tell #3 – Dial

dial in re-hot engravings

the rolex day-date dial is quite a simple one but when closely inspecting its elements you will notice differences here as well

another common tale in most of the rolex newer models that applies to the day-date that we have here on our guide today has to do with the rihot engravings as seen in the pictures on the screen the letters rolex engraved on the rehot will always be perfectly centered with the minutes and seconds markers on the other hand the replica watch will almost always present in perfectly centered letters

if you are trying to authenticate the rolex day-date yourself feel confident to get back at any time to the pictures in this video guide or the pictures available in our written guide on the website and don’t forget that in order to closely inspect different small details you can rely on a specific measure on the zoom option available on most of the mobile phones

clasp and other engravings

Tell #4 – Clasp Engravings

when opening the watches clasp on the outer side you will find specific engravings the biggest difference can be seen with the bare eye on the engraved rolex logo as seen in the pictures on the screen the genuine watch has a clear engraving with an equal depth on the replica day date however the engraving is much more superficial and lighter

another difference has to do with the content engraved on the clasp as the genuine watch will have a u750 engraved while the replica item only has 750 engraved this engraved coat has to do with the material of the watch as it states that the watch was made out of 75 gold and 25 other metals the exact same difference can also be seen next to the case back on the upper side of the watch please see for yourself again in the pictures on the screen

Tell #5 – Watch’s Weight

wait

for this step we will get a bit more technical if you’d like to inspect this tail for yourself you’ll be needing a digital scale by measuring the watch’s weight you will notice that there are substantial differences here as well that have to do with the metals using manufacturing the genuine and the replica watches as the gold is heavier than the metal or metals being used in manufacturing the replica watch to make it short the genuine watch has close to 200 grams while the replica watch has about 120 grams it is worth mentioning that the authentic rolex day date had 23 links without the two endings while the replica watch had 22 links without the two handlings however the difference of about 30 grams doesn’t represent one link manufacturing materials

Tell #6 – Manufacturing Materials

we have already mentioned quite a few times in this video guys the genuine rolex day-date is made out of rose gold and the replica watch most probably has a simple gold plating more specifically the fake watch present here today is assuming a yellow gold day date however differences can be seen and besides the normal color difference between rose and yellow gold we suggest that you look for visible flaws the gold plating will in time is an effect so look after scratches in the material those are definitely a sign that you are not holding a genuine watch in your hand made out of genuine gold

Tell #7 – Movement

movement

for this guide we’ll get more technical we suggest you do not try this at home but you can ask for help from an experienced watchmaker by opening the watch’s case back we are revealing its movement and this specific design when inspecting the movement we can softly move the rotor in different positions so that different parts of the movement will get visible

differences are huge here as the replica watch first has a totally different movement than the rolex caliber 3235 movement present on the genuine watch secondly engravings are much more superficial on the replica watch obvious signs of much cheaper techniques used to manufacture the item

Tell #8 – Box and Papers

box and papers

the journey rolex day date watch comes with a box in which you will find the watch

an instructions manual

a rolex tag

and an international guarantee card the replica watch came in a plastic case it is known that these cases are the original ones used by rolex to ship new watches from the factory to authorized dealers but those are not the cases that should be provided with the watch to the new owner furthermore keep an eye out as there are replica boxes manuals and even warranty cards out there but most of the times you will find different flows in terms of design phones being used or even misspellings thank you for watching

Outro

this new video guide on the rolex day-date watch i hope you enjoyed watching our video and found all this content useful and relatively easy to apply for yourself always remember that you can at any time get back to our video guide on youtube as well as the written guide available for free on our website the link is available in the video description below in case you need further assistance our authentications team can happily assist you with the authentication service available on our website more video guides will be made public in the upcoming period so please don’t forget to like this video and subscribe to our youtube channel in case you have a specific watch model that you would like us to cover in an upcoming video guide please leave us a comment with its name and reference number and we will do our best to have it available for you

thank you once again and see you soon

goodbye

you

Who Can Authenticate My Rolex Day-Date?

The Rolex Day-Date is a statement of success. Crafted only in 18-karat gold or platinum, it commands prices in the tens of thousands and is one of the most counterfeited Rolex models in existence.

With sums like this at stake, relying on guesswork is simply too risky.

Our Day-Date authentication service is carried out entirely by experienced human specialists. We authenticate every reference, year, and edition of the model, from vintage pieces to the latest Everose gold versions. Each watch is examined in detail, with no shortcuts and no automated tools.

When we assess a Day-Date, we look closely at features counterfeiters rarely master:

  • Weekday and date discs, typography, and alignment
  • Rehaut engravings and hidden serials
  • Case dimensions and gold purity tests
  • Clasp engravings, bracelet fit, and weight distribution
  • Dial print quality, lume color, and sapphire clarity

Over the years we have authenticated thousands of Rolex watches, helping collectors avoid costly mistakes and saving millions in counterfeit losses. Our reputation is built on accuracy and discretion, trusted by buyers and sellers worldwide.

Each authentication includes a Certificate of Authenticity. This is more than reassurance, it is your protection. If the watch turns out to be fake, the certificate serves as documented proof you can use for disputes, refund claims, or resale negotiations.

👉 Authenticate your Rolex Day-Date with us today and safeguard the value of your investment.

Conclusion: How to Confirm the Authenticity of a Rolex Day-Date

The Day-Date is not just another Rolex, it is the President’s Watch, crafted only in precious metals and instantly recognized for its weekday display

That prestige also makes it one of the most counterfeited Rolex models, which is why authentication is critical before any purchase.

In this guide, we looked at the checkpoints that matter most, from typography on the weekday disc to the weight and materials of the case and bracelet.

What defines an authentic Day-Date is consistency.

The lettering sits balanced, the rehaut engravings align perfectly, the bracelet feels substantial yet refined, and the case measures exactly 40 mm. Counterfeits often get one or two things right but fall apart when examined closely across several areas.

When authenticating, trust patterns, not single details.

Key checks to revisit:

  • Weekday inscription → Authentic watches must show thin, sharp letters centred in the arch. Fakes will often use fonts that are too thick, oversized, or unevenly spaced.
  • Date placement → Authentic watches must centre every numeral straight within the aperture. Fakes will often drift left, right, or sit crooked.
  • Date thickness → Authentic watches must have crisp, even strokes. Fakes will often print numbers too thick or off-centre.
  • Rehaut engravings → Authentic watches must align “ROLEX” text and crown precisely with the minute markers. Fakes will often misalign or etch text too shallow or too bold.
  • Clasp engravings → Authentic watches must display balanced, shallow lettering with even weight. Fakes will often exaggerate strokes or show mismatched fonts.
  • Weight → Authentic watches must weigh around 215 g with bracelet, balanced on the wrist. Fakes will often feel too light from hollow parts or unnaturally heavy from filler.
  • Materials → Authentic watches must be 18k gold in yellow, white, or Everose. Fakes will almost always be plated steel.
  • Case dimensions → Authentic watches must measure exactly 40 mm. Fakes will often run slightly small or oversized.

Still uncertain?

If you are about to commit tens of thousands to a Day-Date, don’t leave it to chance.

Our authentication service is 100% human, carried out by specialists who know how this reference should look and feel across decades of production. Alongside peace of mind, you receive a Certificate of Authenticity that protects your investment for resale, insurance, or disputes.

Before closing the deal on a Day-Date, let our experts review it. That single step can safeguard your purchase and give you the certainty every collector deserves.

Rolex Day-Date • President’s Watch Certificate of Authenticity available Human experts since 2017

Turn uncertainty into leverage.

Before you move tens of thousands, get proof you can use, not just reassurance.

Protect your money: We verify 18k metal, weight, dimensions and alignment so you don’t buy an expensive mistake.
Win the negotiation: If something’s off, our notes give you the facts to renegotiate or walk away confidently.
Proof that pays back: Add a Certificate of Authenticity for resale, insurance and dispute protection.
Clarity fast: 100% human review with clear, plain-English findings. Zero guesswork, no AI.
Verify my Day-Date now

Discreet. Expert-led. Built to protect your purchase and strengthen your position.

FAQ: Real vs Fake Rolex Day-Date (2025)

1. Where is the serial number on a Rolex Day-Date?

On modern Rolex Day-Date models, the serial number is engraved on the inner rehaut at 6 o’clock, visible through the crystal. Older references place the serial between the lugs at 6 o’clock, which you can see after removing the President bracelet. The engraving should be sharp, evenly spaced, and aligned with minute markers. Weak, uneven, or wandering characters are a warning sign during an authenticity check.

2. Are Rolex Day-Date watches solid gold or plated?

A genuine Rolex Day-Date is made from solid precious metal, typically 18-karat gold in yellow, white, or Everose, and in some references platinum. The case, bezel, and President bracelet links use solid metal, not plating. Counterfeits often use steel with gold coloring or partial plating that wears at edges and clasp. If you are unsure, a competent jeweler can test the alloy and confirm that the watch matches its stated reference and material.

3. Do Rolex Day-Date watches hold value?

The Day-Date sits at the top of the classic Rolex line, and well kept examples tend to retain value. Condition, originality of parts, and desirable dial configurations influence pricing the most. Full sets with documented service history and a clean authenticity record command stronger premiums. Since value is tied to confidence, keep service invoices, photos of reference and serial numbers, and any certificates that support provenance.

4. Is a Rolex Day-Date waterproof for daily wear?

A genuine Day-Date uses the Oyster case and a screw-down crown, rated to 100 meters when seals are fresh. That is suitable for hand washing and light swimming, not for diving. Water resistance depends on gasket condition, crown tube integrity, and proper caseback closure. If you plan to swim with the watch, have a watchmaker pressure test it after service. Avoid exposing unverified pieces to water until an authenticity check and pressure test are completed.

5. Day-Date 36 vs Day-Date 40, which should I choose?

Both sizes are authentic to the line, and the choice comes down to wrist size, proportions, and period-correct preferences. The Day-Date 36 has a classic profile that many collectors associate with the model’s history. The Day-Date 40 offers a larger dial, updated movement, and a different presence on the wrist. For either size, verify case diameter with calipers, confirm bracelet fit and weight, and match reference numbers, dials, and materials to the correct production era.


Need our opinion in regards to the authenticity of your watch? It’s a service we provide.

Have your watch authenticated

Alternatively, we have free authentication resources for watches: written guides and video tutorials.

Thank you for reading this,

Ch Alex

Other authenticity-check guides for you

The three guides below follow the same careful structure, each one tailored to another important Rolex reference. They are helpful if you are comparing the Day-Date to its closest relatives or if you are broadening your knowledge across the brand’s most counterfeited models.

80+ Safest Places to Buy Items Online From

Want to avoid scams for your next sneaker, watch, designer item or bag? Enter your email address and we'll send the FREE guide over.

About the Author

Ch Alex is the co-founder and COO of Legit Check By Ch. Ch Alex is in charge of the "Watch Guides" section of our Legit Check By Ch Library. Alex is also the main host of our YouTube channel where our guides have helped people save millions of dollars in scams. Make sure you subscribe to our channel and check out the videos hosted by Alex!
Read more about the Author →