Rare 18K Seamaster circa 1960

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None of that looks like a serial number.

Ref - 2975 (but doesn't appear to be correct for your watch)
Metal - 18k 0.750

No idea what 429140 is. Possibly patent no.

You'll need the 9 digit serial, possibly starting 16,xxxxxx or similar.
15597203 stamped on movment
Is that helpfull?
 
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15597203 stamped on movment
Is that helpfull?

That’s the number you need to give to Omega for the extract. It means by the way that the movement* was made more like 1957 so earlier than was thought. Other than an approximation of date, only Omega can give you more info based on that, but they charge for it.

*I say movement as the mismatch between case number and movement type may suggest the watch has been altered at some point, and a calendar wheel 503 movement and dial swapped for the original no date 501 that a 2975 would be expected to have. Are you sure there isn’t another 4 digit case number marked with 2975? A photo of the caseback would be very useful. Many gold Omegas are double marked.
Edited:
 
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I tried to do an extract last night, the system would not work. I reported it and then today the Extract page has been taken down??? I feel like there is a conspiracy against the history of this watch!
I think this is the closest match I found... All markings are identical and it is a Seamaster Special... Interesting this was around the time of The 007 Goldfinger Movie as we toured the glaciers where alot of the movie was filmed.
https://www.omegawatches.com/en-us/watch-omega-seamaster-special-ce-166-0010
 
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Calendar feature on a cal. 501 is very strange.

I’m going to make the assumption here that the case is legitimate. All the numbers make sense with the cal. 501 (non-date) movement.

Since these models were long out of production by 1969, my guess is that either Omega or someone with a parts account ordered the parts to “upgrade” the movement with a new plate and matching gold dial from a cal. 503.

This would have been rather expensive to retrofit, but given the value of the watch (even at that time), it could have been done.

I think that this watch will remain a mystery for now.
gatorcpa
 
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It's a nice watch but not terribly uncommon especially in stainless steel. The gold dial and bracelet are nice touches. Definitely not one of a kind and not of huge interest to collectors. The piepan arrowhead dial versions are the ones that are both very uncommon and command significant collector interest - @dsio knows about this.

Also the abstract is important because if there is a mismatch between case and movement then value takes a considerable hit.
 
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The 2 concurrently running threads discussing this are making it confusing to follow the topic but both are converging on the fact that the case and movement don't match. As mentioned above, it is increasingly likely this is a very pretty Franken. The watch is 'rare' perhaps for the wrong reasons.