Paul is correct, the first no trap stocks (SPG) had the large over small hole in the butt area, later changed in the mid 40K serial
number range (May-June 1940) to have two equal sized holes and oval shape pistol grip until Oct 1940. The new stock
had the trap door butt plate. these stocks were cartouched SA over GHS but without the crossed cannon stamp as SA SPG
stocks also were without the crossed cannon stamp. These stocks are quite rare, soon the the crossed cannon stamp was
added to the cartoucheInformation
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