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Counterfeit indicators documented against catalog references: what differs on a fake, where to look for it, and how firmly the observation is established.
Mis-rendered bezel numerals (e.g. upside-down '30')
Bezel · Vostok · Ref. 420
Cheap counterfeit/replica bezels frequently show mis-oriented numerals such as an upside-down '30'. Corroborate with the movement — a bad bezel alone can also be an innocent aftermarket mod.
Reproduction bezel inlays are widespread
Bezel insert · Seiko · Ref. 6138-0030
The coloured bezel inlay is fragile, frequently damaged, and reproduced in volume. Colour match to the dial, print sharpness of the tachymeter scale and the seating of the inlay in the bezel are the checks. A replacement inlay is a common and usually disclosed repair; it becomes an authentication concern only when combined with other substituted parts, or when a listing presents a re-inlaid watch as untouched.
Colourway mixing between the two variants
Dial · Seiko · Ref. 6138-0030
Brown dials appear in black-bezel cases and the reverse, produced by combining two incomplete watches. Neither part is counterfeit; the watch as presented did not leave the factory that way. Check that dial, bezel inlay and subdial tone form one of the two documented combinations.