Short of someone gathering every individually produced movements serial number AND the full caseback sub-reference (‘69, ‘71, ‘74 etc) that was attached to the case when it was assembled I would love to hear proposals to try and overcome the fact that, during this period of history (which was pretty much the time when the quartz crisis was happening) movements within a certain range made it randomly into 3 sub-references...(hint : there is no solution, it is what it is, unless one has a time machine and can go back and force Omega do it differently).
And even if someone was able to get every single produced watch movement SN and caseback sub-reference information explicitly, I would be willing to put my money on the fact that it wouldn't make any difference with respect to the SN ranges whatsoever (other than the fact that one would be able to query their exact watch and know their movement came with an e.g. '74 caseback directly from Omega) as there would still be the same randomness.
ilovemyspeedmaster gratefully uses MWO tables with their permission (and they warned exactly about this period)...every single query is run against their tables, and results accumulated, hence there are 3 answers for that serial number.
I beleive the OP's problem is the same problem I have with all extracts : no extract gives an actual case-back sub-reference, i.e. an extract merely says 145.022, and not 145.022-74. If it did, there would be no question here, other than the assembly date, which is odd as he says, for a '74.
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