headstamp noun 1verb 1forms 3 noun1 •The identification marking on the base (bottom) of a cartridge casing.Photographs were taken of the weapons' serial numbers and [of the] markings on the bottoms of the cartridge casings, known as headstamps, which can reveal where and when ammunition was made. — 2009 verb1 •To affix a headstamp to. formsheadstamped · headstamping · headstamps
