Advice Needed: Seamaster 321

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Hello all, longtime lurker but never owned an Omega or had good reason to post.

Recently my father-in-law passed and as is sometimes the case, we found a watch of unknown origin in his belongings. I had the appropriate tool to open the back of the watch to fetch the serial and such. Attached are photos. We found this watch in an envelope from the old Omega/Tissot Service Center on 16 W 46th St in NYC. My F.I.L. was a lifetime New Yorker, but a real thrifty guy. I imagine he either was given this watch or found it while working at several thrift stores in the 60's.

From what I can see the model and S/N are:
105.004-64
22082885

As it is, I have no idea where to start really after that. I've tried to decode the serial number on the Omega website but I haven't had success and I'm unsure why. Could it be fake?

Currently I have avoided winding it as I don't know why it was at the service center. Is there a chance it was damaged in some way and he refrained from repairing it due to cost? Is it possible he got it repaired in some way or something?

My M.I.L. might consider selling it depending on value, but if the juice is not worth the squeeze, it might end up being a memory piece for my wife or Brother-In-Law, as they both have a preference for small watches. I've found several places that people recommend in NYC, but I don't want my M.I.L. to get taken for a ride or make the wrong choices as far as repair/refurb/value. I'd love a recommendation on next steps from those more experienced in this field.

Thanks very much y'all.

 
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That is a great watch! Everything appears correct as far as I can tell, though better dial pictures would be required. I would suggest not cleaning/servicing/etc anything on this before you sell it, collectors will appreciate the originality.

It is obivously well-loved/well used, so it is not a perfect specimen, but is still quite collectible! You can search the reference number to find other listings (105.004-64), but there aren't many listed. I WILL say that there is a listing on Chrono24 (common reselling platform) of a VERY nice/clean one in Stainless Steel (which tend to be more valuable than a gold capped/filled/plated as this one is) that has been sitting for quite a while at $6000 US. AND that one has an original bracelet. There are others in less exact, but similar spec as this one in the high-4k to mid 5ks (again, those set the 'top' value).

So IMO, that sets the 'upper' value on this one, and I think this falls short of that. The best way to get max value out of this would be to put it on Ebay and let an auction take over, I wouldn't go to a brick-and-mortor, they are obviously going to try to undercut you a bit. That said, I'd estimate that at auction, you'd see ~$4k for this, but of course, anything can happen at auction 😀

Great watch, and I hope it gets well loved! IF you decide to keep it, you'll DEFINITELY want to take it to an Omega certified watchmaker (NOT sending it into Omega, but to a watchmaker near you with a parts account) to do a sympathetic service on it. Expect a service to be ~$1000.