Trying to date my grandad's Omega - 1950's??

Hi all,

I recently started to get interested in watches, and the last time I was home my mother gave me my grandfather's OMEGA. I have not serviced it yet, but before doing so I wanted to ask for a bit of help trying to identify the model, confirm it's original and assuming so have a sense of how scarce/valuable it might be (for my knowledge, no intention of selling it as it has a lot of sentimental value to me).

Based on a bit of desktop research, it seems it could be from 1949-1950 (OT 2617), but chain looks different, etc.

A note on the authenticity question - my grandfather lived sometime in Canary Islands in Spain, which at the time was famous a famous hub for imports but want to make sure it was not also from counterfeit and something got lost in translation there...

Thank you for your help!

Omega did not used crome cases at that time, so the case is properly not from Omega.
If it is an Omega dial it has been redone.
I think you have get it opened to se if there is an Omega movement i it.

Hi both! Thanks a lot for the welcome and the fast and super clear answers! In that case, I think I will just keep it for the value it has to me, but probably not worth starting a trip of fixing, servicing, etc.