30-30remchester said, "every original trench gun should have US and flaming bomb stamps on the reciever and barrel plus a cartouche on the buttstock."
While the WW2 Model 97 trench guns have cartouched stocks and martially marked receivers and barrels, none of the WWI Model 1897 trench guns have cartouched stocks. And most of those same WW1 1897 trench guns are not martially marked (no "US" or flaming bomb marks).
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