El Tejon
Member
South, think that's right, as did the 940, IIRC. Sold more than a few of these circa '88-'92.
I suspect your particular revolver was serial numbered in both places because of the possibility that oversized grips might be installed on it. As things worked out they used the smaller "service" grips. By numbering the frame in both places they left themselves with a full choice of grip options.
It was my impression that the federal firearms law passed in the 30's required a serial number on centerfire rifles and all handguns manufactured after the effective date.