Manufacture date needed......a little help.

Gapper 1

New member
Just picked up Mod.10-7, w/2inch bbl. round butt. Would like to know BD.
The Ser.# is 20D32XX. Any feedback will be greatly appreciated. Thanks in advance! Gapper1 (George).:D
 
Engineering change 7 was in 1977, 1983 started with serial number 17D8901 - and ended with serial number 21D30883
 
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