A cal. 1012 in a chronometer Constellation, is it possible?

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I don't believe Omega will provide a COSC certificate for a 40+ year old watch.

COSC does not sell them to individuals. From the COSC web site:

"What information can the buyer of a certified chronometer watch obtain from the COSC ?
None. The COSC is the repository of analytical results that belong to its customers (the watch brands). It does not have the authority to disclose information to anyone other than the legitimate owners of those results. The buyer should contact the head office of the brand to which the chronometer belongs."

I doubt there is a way to get this certificate, even if one exists.

The way I understand it (edit: especially reading the French version of their site) you can ask a copy from COSC and they'll issue one only, which will be marked duplicata. Also from their website

What if a COSC certificate has been lost ?

A COSC certificate is considered be a valuable document. The COSC is authorised to issue only one copy of a certificate, bearing the word ‘duplicate’. In case of loss of a duplicate, the only way to obtain a new document is to subject the watch to a new control. In this event, only the brand may request this service. The head office of the brand that has marketed the chronometer must therefore be contacted directly.
Edited:
 
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The way I understand it (edit: especially reading the French version of their site) you can ask a copy from COSC and they'll issue one only, which will be marked duplicata. Also from their website

What if a COSC certificate has been lost ?

A COSC certificate is considered be a valuable document. The COSC is authorised to issue only one copy of a certificate, bearing the word ‘duplicate’. In case of loss of a duplicate, the only way to obtain a new document is to subject the watch to a new control. In this event, only the brand may request this service. The head office of the brand that has marketed the chronometer must therefore be contacted directly.

I think you are misunderstanding that section. The FAQ appears to be unequivocal that watch owners don't get anything, and only the brands can get the certificates. But by all means feel free to request a certificate from COSC and post the results here.

Cheers, Al
 
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You were right (should I add of course?)
I called COSC on the phone and they informed that the owner has to ask a duplicate from the watch factory.
The nice gentleman also told me that COSC only keep the results for 10 years. So according to how long the brands keep their records, getting a duplicate for an older watch might be difficult.
Anyway, since - luckily - this isn't my watch, I won't have to choose between EOA or duplicate of the certificate both of which won't exist. Or sending back to the seller for that matter.
 
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Thank you guys.
I'll have to accept it the way it is!

I know that it can be normal to have a movement replaced during a 40+ years life of a watch. I wouldn't be very surprised usually but for this one, the global condition seems so good and original that I really thought this movement came from factory with that case. Maybe a mistake at the time. But we'll never know 🙁

Anyway, the one on eBay confirms the authenticity of the dial / case so at least I have that!
 
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The answer to the question "is it possible?", it obviously is because the OP has the evidence that it exists. Now, whether or not it's possible that this came from the factory as such is completely different! Omega factory? No. Franken factory? Well, lots of parts were interchangeable back then so this kind of mash-up is not uncommon.
 
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You were right (should I add of course?)
I called COSC on the phone and they informed that the owner has to ask a duplicate from the watch factory.
The nice gentleman also told me that COSC only keep the results for 10 years. So according to how long the brands keep their records, getting a duplicate for an older watch might be difficult.
Anyway, since - luckily - this isn't my watch, I won't have to choose between EOA or duplicate of the certificate both of which won't exist. Or sending back to the seller for that matter.

There's no doubt this watch is wrong - I said so in the 5th post of the thread. We agree on that completely, but thanks for verifying that COSC does not give out information to customers.

The OP could try Omega, but there's no point.
 
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I won't go further indeed but thank you for your answers. I learned more about these COSC certificates 😀

It's not original but it's all Omega parts, in excellent condition and runs well. So maybe some people would never buy it and I can understand, but now that it's mine, I like it and I won't stop wearing it because of that little 2 instead of a 1 !
 
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I won't go further indeed but thank you for your answers. I learned more about these COSC certificates 😀

It's not original but it's all Omega parts, in excellent condition and runs well. So maybe some people would never buy it and I can understand, but now that it's mine, I like it and I won't stop wearing it because of that little 2 instead of a 1 !

As long as you are happy with your purchase, that's all that matters. If you do continue to collect Omegas though, there may be a point where you won't look at this watch the same way.

Cheers, Al