I was able to find a version of the early 30T2SCRG chronometer which shares this exact waterproof caseback. It is the Ref. 2254:
From Squelette's (Franco's) web site
http://squelettewatches.com/chronometres-30mm/:
I do not know the reference of the non-chronometer version of this watch, but suspect that the vintage is about the same, around 1940-41.
@FrancoM - since this really is an English language forum, you would get far more information if you were to use
Google Translate or another online language translator. Most of the members on this forum do not speak Spanish.
You have a beautiful early vintage Omega with a cal. 30T2SC movement.
Hope this helps,
gatorcpa
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