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I don’t know a whole lot about Omega but should this not have been your first question to people? Sounds like you’re makîng assumptions based on things you simply don’t know.
In the Longines brand that I follow, the manufacture usually dates the watch using the date the watch was sold to a distributor.
You have a valid point of course, it's just surprising to me it works this way. I would assume you can date a watch by the serial but apparently I'm in the wrong there.