New member requiring help identifying Omega Chronograph

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I have obtained an Omega Chronograph with no serial#. A watchmaker I know opened it up and on the inside back of the case were the numbers 2451 which I think is a reference number. The watch has a caliber 321 movement with the serial number 13803451 which is possibly 1956 but am not sure. I am not a collector but feel this watch is too nice not to have repaired which will cost $500+. Is there anyone out there can can give comments, thank you.

 
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It has issues (hands, crown, scratched dial eyc), but even spending money on a service will not put you out of pocket.

Hardly an accurate or reliable benchmark for direct comparison, but it gives you an idea.

 
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It has issues (hands, crown, scratched dial eyc), but even spending money on a service will not put you out of pocket.

Hardly an accurate or reliable benchmark for direct comparison, but it gives you an idea.


I see one of the missing hands! 馃榾
 
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I see one of the missing hands! 馃榾

Yep, only 3 more to go 馃榿.
 
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I see one of the missing hands! 馃榾
Not sure if it is in the case, my watchmaker only screwed to back of for numbers.
 
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Yes it is a ref 2451, these are also sometimes marked with the ref 174-3 for some reason and can also have engraved case backs. Well worth the expense of getting it serviced and sourcing a sub dial hand.
 
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Yes it is a ref 2451, these are also sometimes marked with the ref 174-3 for some reason and can also have engraved case backs. Well worth the expense of getting it serviced and sourcing a sub dial hand.
Thank you!