Can’t figure out this vintage model (owned)

Hey everyone. First post here as I’ve been slowly developed the watch disease (obsession).

my first post is in regards to a vintage gold omega that my wife just lost the caseback on…..so I can’t figure out the model or reference number so that I can try to replace the caseback or buy a new case. Any guesses? Thanks a ton. We sent it to omega in Switzerland and they just said sorry we don’t have any replacement parts

I just measured. Do you measure case size by the edge of the case or dial? Case seems 31mm from edge to edge (on sides not lugs). What is an example of a hallmark? Sorry ha!

mag yea you’re right. Seems about 33mm. I took the bracelet off, no hallmarks anywhere.

This is the closest I’ve found that makes me feel like it’s a “bumper”? Seems like there is a distinction between the normal font numbers and a cursive flair type numbers. Is it worth trying to order a caseback for a very similar looking watch and hope it can push in or would it literally need to be the identical model

https://chrono24.app/omega/bumper-a...344--id21615080.htm?SETLANG=en_US&SETCURR=USD

Wha some people do for a cheap "display back" is fit a crystal in place of the caseback. That is an alternative....

thank you. I think I figured it out…. Omega bumper 2491. Think it’s worth paying for a $400-$600 watch to steal the caseback off of or try to find an alternative?

What you could also do is register for an account at
You might find a case without a movement. You don't care much about condition, just that you can steal the caseback.

And "worth it" is truly your personal decision, as it mostly is the case if you own and like the watch and plan to keep it "forever". Some ask when it's a watch they don't care about and plan to sell, that makes it a completely different discussion.

Was it a snap on back or screw back?

Similar 33 mm used 3 types of backs. Screw on, snap on and two piece screw on (back with a thin ring that fits around back and screws down tight)

Once you know the type of back. You Google search Omega 33 mm Automatic bumper and look for a similar case to see the back

Or just buy a used case and maybe a used dial (yours may not work)

DON

I have a similar issue (looking for a replacement case back).

Go here:
https://omegaaddict.com/database

search by movement, you'll get all the references that used that movement. Go through and look closely at the case back, and open case pictures. Best I can tell, while there are cases that are very different that use the same movement (things like totally different threads for the back), its common for several cases for a movement to be very similar, if not actually the same, and they seem to use the same back. In later watches it actually sometimes lists multiple cases on the back.

There is a list out there that breaks down the reference number system (the first number denoting seamaster/constelation etc, iirc, other numbers for case material, numbers for strap material even). But watches pre '62 don't have a system that can be understood that way.
In my case I think I have a 14710... except that the 14700 looks basically the same (and the pictures in the database might show a replacement crown) and the database sadly doesn't have dimensions. So I just bought a 14700 caseback on ebay and we'll see if it fits. I would not be surprised if the 14710 and 14700 are the same case, but differed in some other way, like strap.

I did go a little crazy at one point and start looking at movements of similar size to the 501 in mine, then look at all the cases ever used for them... then look for any case backs for those... but that's a total rabbit hole.