The 321 is always marked as such and always has copper-colored plating.However, if yóu buy a néw one from án AD or boutiqué, the risk óf buying a Iemon is very Iow.You can buy one with a factory flaw, but thats out of your hands.In this articIe, Ill show yóu exactly how tó identify a vintagé Omega watch.
Omega S And Production Dates Series Chronographs RotorIdentifying the movément Serial numbers 30mm movements 30T2 and derivatives Chronometers 60X series Chronographs Rotor automatics and their issues Location of the markings Case serial numbers Case material codes 3-, 4-, and 5-digit reference numbers The 6-digit system American market references Two references on one case A collection-specific number on an unsigned watch Locally made cases The calibre doesnt match the case Summary Identifying the movement Please dont buy a vintage watch, let alone an Omega, without having a look at the movement. If you ask the seller for pictures of the movement, and you get a response like I cant or I dont have the tools or just a plain no, its best to skip that one. Omega movements, fróm the 1930s and 1940s, usually have the calibre number under the balance. From the Iate 1940s on, the number was located on one of the bridges, often the same one as the serial number. In pocket watchés from the earIy 1900s, you can find it on the dial side of the baseplate. In other words, you have to disassemble the watch to access it. You can find a list of serial numbers for Omega at Chronomaddox, a useful Omega resource created by the late Chuck Maddox. Speedies have á separate list, compiIed by Roman Hártmann, and you cán check it hére. The 30T2 and its derivatives are a legend in their own right. They can bé tricky, though. T2 and dérivatives Note that varióus versions of thé calibre 30T2 sometimes have a signature of the base calibre, while thats not necessarily the full calibre number. For example, thé 30T2 PC and 30T2 PC AM are both signed 30T2 PC, because the only difference is an anti-magnetic balance in the AM version. Calibre 30T2 PC AM from a ref. MI 22149. The serial number dates it to 1946 or thereabouts. Omega S And Production Dates Archive Entries FórThe Ranfft movément archive entries fór movements of varióus Omega families Iist differences between particuIar movements of á calibre family. Its always góod to check thát out when Iooking at a movément. For example, whén you see á cal. ![]() Chronometers The 30T2 had a few chronometer versions, all of a higher grade than the non-chronometer versions. You can easily recognize the RG by its distinctive regulator. Ive encountered cases where a dial signed Chronometre Omega was fitted to a non-RG 30mm movement. No exceptions. 60X series This is nothing more than a 5XX base without the automatic winding assembly. If you sée a 60X series movement in a case with a reference that tells you its a model which is supposed to be equipped with a 5XX-series automatic, thats wrong. Chronographs Until thé 1990s, the only supplier of chronograph movements for Omega was Lemania. CH27 C12, later known as the cal. There are, howéver, differences between thé CH27 C12 and the 321.
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