Authentication Standards

Authentication notes recorded against catalog references: what to examine, what it establishes, and how well evidenced it is. Every note links back to the reference it was written for.

387 authentication notes

Bezel

Beaded bidirectional slide-rule bezel
HighHigh confidence
Breitling · Navitimer · Ref. 806
Early 806 bezels have a fine beaded edge and a correctly printed logarithmic scale that aligns with the inner rehaut; reprinted or misaligned scales are common on redials.
Bezels and inserts are consumables on a sixty-year-old diver
MediumProbable
Yema · Superman · Ref. Superman (1963)
Period Superman bezels and their inserts have been replaced routinely — they take the wear, they get damaged, and parts have circulated for decades. A replaced bezel is a service or restoration finding and is very common; it is not evidence against the watch. What it does mean is that the bezel cannot corroborate the rest of the watch, and the lock mechanism becomes the more informative feature.
Cerachrom bezel with platinum-filled numerals

HighHigh confidence

Rolex · Submariner Date · Ref. 116610LN

Genuine Cerachrom numerals are PVD platinum-filled, sharp and evenly recessed. Painted or shallow numerals indicate a fake insert.

Cerachrom tachymeter with moulded numerals

HighHigh confidence

Rolex · Cosmograph Daytona · Ref. 116500LN

The ceramic bezel numerals are formed and PVD-filled; the tachymeter scale must be crisp and correctly graduated. Painted or misaligned scales indicate a fake.

Ceramic bezel insert, not aluminium or printed steel

MediumProbable

Rado · Captain Cook · Ref. R32105153

The insert is high-tech ceramic: dense, cold to the touch, with markings that are inlaid or engraved rather than printed on the surface. A bezel whose markings can be felt as surface printing, or which warms in the hand like metal, is not the specified component. Ceramic also chips rather than scratching, so an insert with a small chip and no scratch haze is behaving correctly.

Count the sides and check their regularity

MediumProbable

Baume & Mercier · Riviera · Ref. Riviera (1973 original)

Twelve sides, and their equality and the crispness of the transitions between them are the design's whole character. Polishing rounds the transitions, which is common on a watch of this age and is a condition finding. A bezel with unequal facets has either been heavily reworked or does not belong to the watch.

Dot-over-90 (DON) bezels

Medium

Omega · Speedmaster Professional Moonwatch · Ref. 145.022

Early 145.022 bezels place the dot over the '90' on the tachymeter scale; DON bezels are period-correct for early examples and frequently swapped in.

Eight hexagonal screws

Medium

Audemars Piguet · Royal Oak Jumbo Extra-Thin · Ref. 5402ST

The octagonal bezel is secured by eight white-gold hexagonal screws whose slots are aligned; misaligned or Phillips-head screws are incorrect.

Eight hexagonal screws

Medium

Audemars Piguet · Royal Oak Jumbo Extra-Thin · Ref. 15202ST

The octagonal bezel is secured by eight white-gold hexagonal screws whose slots are aligned; misaligned or Phillips-head screws are incorrect.

Eight hexagonal screws

Medium

Audemars Piguet · Royal Oak Jumbo Extra-Thin · Ref. 16202ST

The octagonal bezel is secured by eight white-gold hexagonal screws whose slots are aligned; misaligned or Phillips-head screws are incorrect.

Eight hexagonal screws

Medium

Audemars Piguet · Royal Oak Selfwinding · Ref. 15400ST

The octagonal bezel is secured by eight white-gold hexagonal screws whose slots are aligned; misaligned or Phillips-head screws are incorrect.

Enamel condition is the primary evidence, and perfect enamel is suspect

MediumProbable

Hamilton · American-Era Named Wristwatch · Ref. Piping Rock

Ninety-year-old fired enamel on a worn watch normally shows chips at the numeral edges and at the case corners. Modern re-enamelling and epoxy fills present as a uniform, slightly soft black that sits proud of the metal and does not chip. Re-enamelling is a legitimate restoration; it is a finding about originality that has to be recorded, and on this model it is the single most common one.

Interchangeable aluminium inserts

Low

Rolex · GMT-Master II · Ref. 16710

The 16710 was sold with Pepsi, Coke and black inserts, all factory-correct and swappable — so bezel colour alone does not date the watch.

Operate the lock — it is a mechanism, not a decoration

CriticalProbable

Yema · Superman · Ref. Superman (1963)

Engage the hinged bridge and try to turn the bezel. On a correct Superman the bezel is held firmly and cannot be rotated; released, it turns normally. A bridge that is present but does not clamp, or a bezel that turns with the bridge engaged, indicates a replaced bezel, a worn or damaged lock, or a homage that reproduced the appearance without the function. Test it before assessing anything else on the watch.

Six H-shaped screws, aligned

HighHigh confidence

Hublot · Big Bang · Ref. 301.SX.130.RX

The bezel is fixed by six H-shaped screws whose slots are aligned. Misaligned, Phillips or slotted screws are a strong counterfeit indicator.

Six H-shaped screws, aligned

HighHigh confidence

Hublot · Classic Fusion · Ref. 542.NX.1171.LR

The bezel is fixed by six H-shaped screws whose slots are aligned. Misaligned, Phillips or slotted screws are a strong counterfeit indicator.

Six H-shaped screws, aligned

HighHigh confidence

Hublot · Big Bang Unico · Ref. 421.NX.1170.RX

The bezel is fixed by six H-shaped screws whose slots are aligned. Misaligned, Phillips or slotted screws are a strong counterfeit indicator.

The bezel is bi-directional, and that is correct

LowProbable

Seiko · 62MAS · Ref. 6217-8001

The 6217 bezel is a friction bezel that turns both ways. Unidirectional dive bezels became the safety norm later; a 62MAS that rotates freely in both directions is behaving as it should, and a listing describing this as a fault or a repair need is mistaken. Note that this differs from the modern SLA and SPB recreations, whose bezels are unidirectional.

The no-decompression table is the model's distinguishing feature and it is replaceable

MediumProbable

Doxa · SUB 300 · Ref. SUB 300 (1967)

The bezel carries dive-table figures rather than a plain minute scale, and the specific table printed on it varies by period and market. Bezel inserts are consumable parts: they fade, they are damaged, and they are replaced — including with reproductions. An insert whose printing is crisp and unfaded on a case showing fifty years of wear has been replaced. That is a service or restoration finding, not a counterfeit one, and it is very common.

The octagon has a specific proportion and copies approximate it

HighProbable

Chanel · Première · Ref. Première

The bezel is not a generic octagon: its facet widths and the ratio of the octagon to the case rectangle are drawn from a specific object. Counterfeits reproduce an eight-sided bezel with the facets wrong — usually too even, where the original's are not. Measure against a documented example rather than judging by eye; as on the Hermès designs, the proportion is the identity.

Thirty bezel notches on this generation, not forty

HighHigh confidence

Chanel · J12 · Ref. J12 (2000 original)

The pre-2019 bezel has thirty notches; the 2019 redesign took it to forty. Counting them is the quickest way to establish which generation is in front of you, and it works from a photograph — which matters here because this generation's solid caseback denies you the movement.

Two-colour Cerachrom Pepsi

HighHigh confidence

Rolex · GMT-Master II · Ref. 126710BLRO

Rolex's red/blue ceramic bezel is a single monobloc part with a crisp colour boundary; blurred colour transitions or a painted look are strong fake indicators.

Bezel

Bracelet