A fake Rolex 278271 is a counterfeit version of the Rolex Datejust 31 in Rolesor, and the quickest way to identify one is to compare the case engravings, date magnification, and movement beat rate against Rolex's published specifications for that reference. The genuine watch uses a 31 mm Oyster case in Oystersteel and Everose gold, a calibre 2236 movement, and Superlative Chronometer certification rated to -2/+2 seconds per day, three details most replicas fail to reproduce.

What Reference 278271 Actually Is

Before judging any watch, know the original. The 278271 belongs to the Datejust 31 line, the smallest current Datejust size, and sits in Rolex's Rolesor family, meaning the case combines Oystersteel with Everose gold. Key characteristics to memorize:

• 31 mm Oyster case with a screw-down Twinlock crown
• Calibre 2236 automatic movement with a Syloxi silicon hairspring
• Roughly 55 hours of power reserve and a 28,800 vph beat rate
• 100 m water resistance
• Fluted or smooth bezel, Jubilee or Oyster bracelet
• Date window at 3 o'clock under a Cyclops lens

Because the 278271 mixes two metals and carries a small case, it is a favorite target for counterfeiters. The size makes flaws harder to see in photos, and the gold portions are easy to fake with plating.

Case and Metal Checks

Everose gold has a warm pink tone that stays consistent across the case, bezel, crown, and bracelet center links. Plated replicas usually show a slightly different shade on the crown or between the lugs, and the plating wears through at the edges within months. Run a fingernail along the lug edges: genuine finishing is crisp and even, while counterfeit cases often have soft, rounded transitions.

Look between the lugs at 12 o'clock for the reference number and at 6 o'clock for the serial. Genuine engraving is shallow, sharp, and filled with a dark coating. Fakes use deeper, wider stamps with rough edges and uneven spacing.

Dial and Date Window

The Cyclops lens is the most reliable visual test. On a real Datejust 31, it magnifies the date roughly 2.5 times and sits flush against the crystal with no visible gap. Replicas often show a smaller magnification, a cloudy lens, or a date font that is too bold or too thin. Compare the shape of the coronet at 12 o'clock: five points, each with a specific taper and a base with oval dots. Counterfeit coronets tend to look flat or heavy.

Check the dial printing under a 10x loupe. Genuine text has clean edges and consistent spacing. Chromalight lume plots should be uniform and sit inside polished gold surrounds.

Movement and Balance

The Datejust 31 has a solid caseback, so the movement is not visible without opening the watch, which should be done by a watchmaker. Two indirect tests help. First, listen to the beat: 28,800 vibrations per hour equals eight ticks per second, a smooth sweep. Many fakes use 21,600 vph movements or quartz, which look slightly jerky or tick once per second. Second, feel the winding. A calibre 2236 winds with light, consistent resistance, while counterfeit movements feel gritty or spin too freely.

Bracelet and Clasp

On the Jubilee bracelet, genuine center links are solid gold and the outer links are steel. Flex the bracelet and look at the gaps: real links sit tight and even. The clasp should close with a firm click, carry a crisp coronet stamp, and show no tool marks. Weigh the watch if you can. Everose gold is dense, so a genuine 278271 feels noticeably heavier than a steel replica of the same size.

Papers, Cards, and Price Signals

• Ask for the original warranty card, box, and any service receipts
• Verify the serial on the card matches the engraving between the lugs
• Treat prices far below the secondary market range as a warning sign
• Request macro photos of the lugs, clasp, and date window before paying

Where to Confirm Authenticity

A Rolex service center, an independent certified watchmaker, or a reputable auction house can open the case and verify the movement, the engraving, and the reference. If a seller refuses to allow an inspection or asks you to meet somewhere that rules it out, walk away. When a fake Rolex 278271 looks convincing in photos, the movement and the metal are where the truth shows.