Hi there,
these are the new pics with the movement and the back case
Thank you again for your help

 

The watch does have 37,5 mm case

 

And i suppouse the movement to be the 26.5

 

Yes, cal. 26.5. Everything looks good!

Is the first number of the movement serial number an 8?

 

Yes it is num.8

 

So the mouvement number matches the case number one! The watch dates back around 1935 and looks legit.
I am sure Yann (@Tire-comedon) will have more info.

 

Yupp, thank you...i read somewhere else that movement was from 1926 to 1935 circa in fact ...
Thank you for your help, really appreciated !!!!

 

The caliber (26.5) dates back to 1926, and was produced untill 1950. But the serial number indicates that your particular movement dates back to circa 1934.

By the way, when looking at the datas matching serial numbers and years, you have to take care of a typo. The Omega official doc states that the 9 000 000 serial numbers dates back to 1926, though it should be 1936. See above:

 

Thank you again !!
A new world is opening to me now and i like a lot...i love vintage items a lot..being me an avid flyfisher , i m collecting vintage fly fishing reels for example ...

 

Being i new to this world, i don t understand why the number code of the movement that begins with 8 , matches with that of the back case that begins with 9 ?
Sorry for my ignorance...

 

Just look at the doc I posted in my previous message and compare the case numbers and the movement ones!

 

Thank you !!