1966, 1967, 1968... What do we have here?

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We often make glib remarks, alluding to the concept that the Omega factory just threw watches together using up old hands dials and parts, because they were "lying around" or there was a desire to "use up what was lying around"

When I think about the Swiss nature, and manufacturing methods, it does not fit.

Then in my conversations with older watchmakers, more than one has told me stories of speedmasters serviced in small batches and parts, including casebacks from different references, swapped at final assembly because it was not considered important.

On the subject of non pro dials leaving the factory in Assymetric cases, well I do not believe it happened.

The op watch is a franken.
 
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Indeed can't believe the a-symmetric case originally left the factory in Bienne... the OP watch has the wrong dial for sure
 
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Indeed it shows rare combinations were made with vintage parts... However I still believe there's a chance that the combination in the original post could be correct as Omega used up all parts before production of the 861 versions 👎

Using up "all parts" before production of a new model makes zero sense. Long after a model is no longer made, they keep spares for service. If any parts were "left over" they would be used for repairs rather than Omega making frankens...