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If there are no signs of oxidation I suspect it might be from rose (pink) gold...
Either it is gold plated or solid gold - then you should be able to find tiny hallmarks for the gold content.
I advice to go to a watchmaker and let it be opened. Take a good camera with you and take some pictures of the movement and the inner case back -
there you will find inscriptions and markings, perhaps hallmarks for the alloy.
Then we will be able to tell you more.
From first sight the watch looks pretty good. So I would not consider to have it restored - leave it in this vintage look and do not touch the dial!!
Maybe it will only need a professional cleaning and lubrication of the movement and it may serve you for decades to come...
kind regards
Erich


Cal 265s were introduced in 1949 when the old 30T2 was renamed so I don't think that watch could be 1947.
Cheers
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which country are you in ?
the reason i ask is that i'm in UK and have a friendly ex Omega watchmaker who charges a lot less than sending it to Omega. any good local watchmaker should be able to do the job so no need to pay the huge prices Omega charge if you dont want to.
best
Graham