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Hello - the inside of the caseback may provide a reference number.
Can we see a picture of the inside of the caseback?
Hi @RicardoCosta, and welcome.
I’m sure someone can help but you’ll need to post better and more focused photos.
Also the inside of the caseback.
Yes, of course.
There is a "18K" mark on the left side of the caseback. On the top of my head I can't remember which countries used that marking, but it may help us, if you tell where you are from. Brazil?
Hey,
Thanks again for your help.
I'm from Portugal but my great-grandfather was from Brazil. I don't really know where he bought this watch.
It can be from Portugal or Brazil.
Brazilian made gold watches are a common thing to see and I think they used the "18K" hallmark. There is no Omega reference number or model name as such, as it is a locally produced case with a Swiss movement. It was common in a number of countries to make their own gold cases due to import tariffs on gold products. Brazil, France, USA and England are amongst the countries that used to do this.
There is likely to be no name or reference number, sorry. Your best bet is going through Brazilian Omega adverts from around 1950 and see if you can find one that matches. Even so, it is likely that it will only say that it is a man's watch in 18k gold.