I found something about thia a while vack but can't remember.

It's a cal 265.
2639
12355076

Can I find out which year it was made with that information?

 

Only way to know exactly is to order an Extract of the Archives from Omega. It costs 120 CHF

https://www.omegawatches.com/customer-service/extract-of-the-archives

 

This page will give you an estimate. If you can live with that you can pocket the 120 CHF.

https://est1897.co.uk/omega-serial-numbers-how-old-is-your-omega-watch

 

So cal 265 was made earliest from 1950 according to that site? I searched around before and I thought it was made from 1949?

 

Yes, the cal 265 was first introduced in 1949 according to A Journey Through Time.

 

Where in the article does it say that the 265 was made earliest in 1950?

 

From the site you linked: But I heard about 1949 regarding to cal 265 before so I guess that site is just a estimate.

11,000,000 – 11,999,999

1947

12,000,000 – 12,999,999

1950

 

The cal 265 was used for many years. 1949 was just when it was introduced. You can very we’ll have a cal 265 Omega from 1950.

 

Ok then I know when it was introduced at least That site made me confused and thought they meant it was introduced 1950. But I really want to know if it's from 1949 or 1952 as an example.

 

Then you know what to wish for for Christmas
It is likely from 50 or 51 but the extract is the only way to know for certain.