zOwie Omega Discussion Forum

This is not an Omega factory case. The markings in your case are those of watchmakers, recording when they serviced and watch with a date or a ticket number.

These are examples of factory cases.

Here is a 1943-4 Omega case back from a calibre 30 T2 movement

You can see the Omega factory marking in the the triangle; the case manufacturer (slightly unusual); the Plaque Or (gold plated) 60 microns; and the model number 2905-1 SC, or more commonly 2905.

Since this is not a solid gold case, it does not have a case serial number (prior to about 1943 all cases had serial numbers).

This is an example of a 1934 stainless steel case (ACIER STAYBRITE), showing the Omega factory mark, the metal and the case serial number. This case does not have a model number, which Omega began using in the 1940s.

This is a 1948 gold cased watch, in which you can see the Omega mark, the metal mark (18k/0.750), the case serial number and the model number (2500)

Omegas were often imported into certain countries with only the watch movement and face, and cased locally. The first example above, for instance, was likely imported into the US and cased locally, but with Omega approved markings.

Your watch was either cased locally or the original case lost, perhaps sold when times were hard and gold was expensive, then later recased in the unusual and precious 19k/.0800.

Sam