1939 omega (I think?)

Hi all.
Just wondering if anyone can provide me any info on watch this for me? Including approx value, and the best place to sell?
I don’t have much info, it was my grandfathers, it still runs, inside the back case a few dates have been etched in, I assume when it was serviced.
I’m also guessing about its vintage base on a website I found that gave me an estimated year from the serial number displayed on the movement.
And yes, there is a bit of visible wear and tear.
I’m in 2 minds about selling it. Yes it was my grandpas and there is some sentimental value, I don’t wear it and it seems a shame to leave it sitting in a cupboard when others may appreciate it more than myself.
Look forward to your comments.
Cheers.

Thank you Dan.
I was feeling the same way.. my boys are a bit young yet, but maybe they will enjoy/appreciate it in the future.

Wow. I had been searching for a similar dial configuration and reference and saw your watch. It must be a very rare dial and may be worth trying to find a donor case and transfer the movement and dial. Let me know if you have found out more information since your post, but this is likely a pre-Officer CK2165 or predecessor reference.

Here’s mine - same dial typeface and hand styles: