I can't be specific, but it seems like the un-numbered FXO mags. turn up with the 1941 and 1942 guns. I don't know if there was a certain serial number where the change-over was made. But IMHO any 1941 or 1942 with either correctly numbered mags or un-numbered plastic mags could be correct.
Not as definitive as we would all like, but...
dju
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