CSI on my "first" watch...

... which I bought for the simple pleasure of wearing a watch, not to tell the time.

It was more than 32 years ago and I bought it without a bracelet or strap. I bought it at a jewelry store with watches and other used jewelry, on a main street in Barcelona.

It came without a bracelet and the one that has it I ordered in memory of my grandfather, who always wore one like that.

But let's go to the clock. The truth is that I have not been able to find any dial exactly the same on the internet. Maybe it's a franken, or not. It really doesn't matter much to me, since this particular piece has been my watch for many years (also a young person, 23-24 yo wearing this watch, was striking, in the middle of the digital watches and pop fever (I know, I've been always a vintage man 😀))

So, let's see what I think:

Model: ??
Caliber: 531
Serial: 11,952,245
Manufacturing year: 1947 - 1948?
Caseband: ?? Not sure it is Omega ... the lugs are not "constellation" type as I have seen, or could correspond to another model? . Diameter w/o crown 37mm. Lug to lug 45mm. lug width 17,5mm
Caseback: Strangely it has a different serial number ... (10.921.015) could it correspond to another caliber and model? (caseband and caseback coming from another model) What is the other number 2481 that is in the case back?

And now the photos.

Any hint or guess is greatly appreciated.

@mac_omega , thanks for your comments (and offer). I have never sold a watch (yet... I supouse one day I will have to solve this...😁)

@gatorcpa , thanks also, but I see some missalignment on the infomration of ck-2481 and my watch:
1) the lugs. The way that the lugs are fixed in the case according with Omega model are not like mine.
2) In the Omega wheb they say that the movement is manual winding 😕 😕, nevertheless the 351 is automatic... I guess that is a mistake in the omega web???

Many thanks again. 😀