case reference number and movement date don't match

by David
(Midhurst, England)

The reference number on my speedmaster is ST105012-65
But the cal. 321 movement is 25440641 which means it was made in 1967.
I received an extract from the omega archive which confirmed it was made in 1967 but gave the reference as 145012. I've been told by many people that omega made cases in batches & used them as needed.
I've tried telephoning the omega museum for info. but it is permanently busy.
Does anyone have any ideas ?

Comments for case reference number and movement date don't match

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Contacting the Muesum will not help
by: OWEx

these are more or less the same people who sent you the archive extract.

Unfortunately, the information you learned so far is correct. This was a transitional period between the 105 and 145 cases and it seems that Omega use parts from different production batches to assemble the watches. SO although your watch had left the factory as a 145.012 it might have been fitted with 105.012 case back that were still in stock. I have seen a number of documented cases over the years of 145.012 with 105.012 backs.

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