Asking for help to authenticate this seamaster 2531.80 please

Here is one for sale currently in the Private Sales section to compare helium escape valve. It does seem to be above the 10 mark.

I have a 2551.80 (mid size version) and the helium escape valve is a bit above the 10 mark as well.


To my untrained eyes, the omega logo on the case back, under the seahorse, seems bigger as well than the one for sale (and mine all proportions respected).

The Omega on the dial seems to me a bit thin (font) when comparing to mine and the one for sale... But again, it can be my eyes, my phone etc

Other members will surely have more expertise to give you.

Cheers

This is some sort of franken at best, or an outright fake. The serial number is not for this model:

Serial number: 60232827
Article ref: 25012100



As I look closer at the movement, I see there are screws that should have flat polished heads, that have rounded and nor polished heads, so I looked at the mark on the main plate where it should have an Omega symbol and 1120 marked, but instead is appears to have 2892-1:



So it appears to be a movement that is part ETA base movement, with some Omega Cal. 1120 parts added to make it look genuine, using a serial number from a completely different model.

If you look at the placement of the HEV on this genuine 25318000, you can see that it doesn't line up with the 10 o'clock marker like your does.



So I'm guessing mostly fake but with some genuine parts...

Cheers, Al