Ron,
Good additional info.
Look for other numbers on your mom's gun: on the back of the rear toggle above the frame; on the bottom edges of the takedown lever and sideplate; on the bottom inside surface of the front toggle piece (oppostie the DWM logo); anywhere on the breechblock; firing pin; trigger, under the trigger plate.
A photo of the front of the frame of this gun (with the receiver in place) would be useful to determine if the metal has been worked on.
Glad to know these guns are in active use.
--Dwight
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