In 1940, Doxa introduced a 7-digit serial number system, with the first two digits corresponding to the year of manufacture. In other words, 40XXXXX corresponds to 1940, and so on. The serial is always stamped on the outer side of the case back. Movements had a Doxa stamp on them, but no serial.

How can you tell if a Tag watch is real?

The Papers One way to tell whether a TAG Heuer watchs certification is real is to look for the embossed holographic seal on the document. It should also carry the unique serial number that matches the one engraved on the watchs caseback.

How do you tell if a watch is a knock off?

Authentic Watches Quality To identify a fake, look for unfinished edges, improper polish, scratches, and even wrong markings/engravings. Also, check if the watchs clasp/buckle works fine, if the screw down crown works and whether the watch needles can be guided by the screw that adjusts the time.