Rare 18K Seamaster circa 1960

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I posted 2 years ago trying to find details on a watch I inherited from my Grandfather. I was with him when he purchased it in Lucerne, Switzerland.
I'm guessing there was a technical issue with the forum and I never saw/received any replies.
While doing another google search I stumbled on discussion and photo that looked like my watch... ( It was my watch) and I thank everyone who offered input and I apologize for not responding sooner.
Well, it appears I have a very rare watch as I have not been able to find another one of its type after much searching.
That being said, will its rarity reflect in its value???

I'd like to see your opinions as I'm getting older and do not have family to pass it on to.

These are the numbers in the case 2975 SC 429140 18K 0.0750 143
Please share you opinion on value. I have already received so opinions and would like as many as possible.
Thank you all for your help!
 
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Can you link the original thread? Never mind, I see you already posted in the other thread. No need to have two.
Edited:
 
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Very nice.

I'm going to guess around 拢4000 with the bracelet. If it was white gold another thousand or two on top.

Solid gold watches aren't really my bag though so don't take that as gospel. Have you done any research since your last post? What have you found?
 
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Still wondering about the reference since that reference should have a 501 which is a no date caliber. Did it share a case with a calendar?
 
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I had the case opened and was able to confirm the numbers as posted above. I have not been able to find another watch like it anywhere. Is it possible it's one of a kind?
 
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It is odd that the reference is 2975...that would signify a non-calendar Seamaster.

It would be very helpful if you could share photos of the actual caseback (not just numbers) and movement.
 
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When I has the case opened, the Omega dealer simply wrote the info on paper and then pressure sealed it.
I guess I'll need to split it again.
 
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Have you got pics of the inner caseback and movement?
Have you considered an Extract of the Archives?

You say you were with your grandfather when it was purchased? Where was this? If a jewellers it's highly unlikely it's a one of a kind. Just rare like the white gold Constellations we occasionally see
 
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It is odd that the reference is 2975...that would signify a non-calendar Seamaster.

It would be very helpful if you could share photos of the actual caseback (not just numbers) and movement.

I wonder if they produced a limited run of these in 18ct, both date and no date and used the same casebacks for each?
 
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Have you ever seen one of these??? What is Extract of the Archive? How do you do that?
 
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Search on this forum or google for examples.

Basically you can provide Omega with your serial no. and they will create a certificate with all the info they have on the watch (date of production, reference, country delivered to, possibly additional comments such as bracelet info).
 
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Given that the reference no you provided is suspect, I'd try and order an extract based only on the serial, not the reference no.
 
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Given that the reference no you provided is suspect, I'd try and order an extract based only on the serial, not the reference no.
Based on this data: 2975 SC 429140 18K 0.0750 143 All I understand is the 18K 0.0750 and 2975. What is the rest?
 
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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.
 
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There is a similar watch (no date, no gold dial) on offer from a dealer:
https://www.worldoftime.de/en/omega/seamaster-17111.html
143 would be the case manufacturer hammer mark (Classicor SA), same in the above example. And finally, 429140, maybe a case number (again, the above dealer's watch seems to have a similar number). I can't explain the no-date reference on the case back.