Dr No[Moderator Omega - Wristscan]
37670
Correct, the movement numbers for all examples fall within a narrow range . . .
. . . which buttresses the P.A.F. engraving on the movement.
Years ago Nilo, our second Omega forum moderator, said that no one can be really sure if a vintage watch is truly original. He was right; the sole exception to the rule would be a P.A.F. Yeah, the dial could come from another specimen, but the odds of that are astronomical.