
1) Ammunition
Found on
https://www.crosswordclues.com/clue/headstamp

A headstamp is the markings on the bottom of a cartridge case designed for a firearm. It usually tells who manufactured the case. If it is a civilian case it often also tells the caliber, if it is military, the year of manufacture is often added.
Found on
http://en.wikipedia.org/wiki/Glossary_of_firearms_terms

A headstamp is the markings on the bottom of a cartridge case designed for a firearm. It usually tells who manufactured the case. If it is a civilian case it often also tells the caliber: if it is military, the year of manufacture is often added. The headstamp is punched into the base of the cartridge during manufacture. A resource for identifying...
Found on
http://en.wikipedia.org/wiki/Headstamp

Markings impressed into the base of a cartridge case, normally identifying the maker's name, the cartridge calibre designation, and sometimes the date.
Found on
http://www.hallowellco.com/abbrevia.htm

A headstamp is a marking found on the bottom of a cartridge case usually denoting the year of manufacture and the originating factory.
Found on
http://www.probertencyclopaedia.com/browse/FH.HTM
No exact match found.