List of military headstamps

A headstamp is the markings on the bottom of a cartridge case designed for a firearm. It usually tells who manufactured the case. Military headstamps usually have only the year of manufacture.

The headstamp is punched into the base of the cartridge during manufacture. A resource for identifying where the ammunition originated can be found at Cartridge Collectors.

Military Headstamps
Two digits are the last two digits of the year of manufacture. Early 20th century cartridges may have additional digits or a letter indicating the month of manufacture. The letter code indicates the place of manufacture:

US Arsenals

 * FA Frankford Arsenal - Philadelphia, Pennsylvania
 * AO or KS Allegheny Ordnance Plant (Kelly Springfield) - Cumberland, Maryland: Operated by Kelly-Springfield Tire Co., a division of Goodyear Rubber.
 * DEN Denver Ordnance Plant - Denver, Colorado: a division of Remington Arms. (1941-1945)
 * DM Des Moines Ordnance Plant - Des Moines, Iowa: a division of US Rubber Co. (January 1942 to July 1945)
 * EC Evansville Ordnance Plant (Chrysler) - Evansville, Ohio: a division of Chrysler. (June 1942 to April 1944)
 * ECS Evansville Ordnance Plant (Sunbeam) - Evansville, Indiana: a division of Sunbeam Refrigerator Co.. (1942-1944)
 * EW Eau Claire Ordnance Plant - Eau Claire, Wisconsin a division of US Rubber Co. (August 1942 to December 1943)
 * LC Lake City Ordnance Plant, Independence, Missouri: a division of Remington Arms. (1940–Present)
 * LM Lowell Ordnance Plant, Lowell, Massachusetts (1942-1943)
 * M Milwaukee Ordnance Plant - Milwaukee, Wisconsin: Operated by US Rubber Co. (August 1942 to December 1943).
 * P or PC Kings Mills Ordnance Plant (Peters Cartridge Company) - Kings Mills, Ohio: a sub-contractor owned by Remington Arms from the 1930s until its closure in 1943.
 * SL St. Louis Ordnance Plant - St.Louis, Missouri: (November 1941 to June 1945)
 * TW Twin Cities Ordnance Plant - Minneapolis, Minnesota: (1942-1945; 1950-1957; 1965-1976; 2002-2005)
 * U or UT Utah Ordnance Plant - Salt Lake City, Utah - a division of Remington Arms. (March 1942 to December 1943).

Civilian Contractors

 * FCC Federal Cartridge Corporation - Anoka, Minnesota
 * RA Remington Arms - Bridgeport, Connecticut
 * US United States Cartridge Company - Lowell, Massachusetts (1867-1926).
 * W or WCC Western Cartridge Company - East Alton, Illinois
 * WRA Winchester Repeating Arms Company - New Haven, Connecticut

Commercial Cartridges
The US military used commercial cartridges for its training rifles, non-standard weapons, and shotguns. These usually had different headstamps than the military ammunition (usually their civilian one) and were shipped in commercial crates rather than military packaging.
 * ♦ Western Cartridge Company - East Alton, Illinois:
 * F Federal Cartridge Corporation - Anoka, Minnesota
 * H Winchester Repeating Arms Company - New Haven, Connecticut:
 * P, PCCo or PETERS Peters Cartridge Company - Kings Mills, Ohio:
 * REM-UMC Remington-Union Metallic Cartridge - Bridgeport, Connecticut
 * U Remington Arms - Bridgeport, Connecticut:

Commonwealth Military Cartridges
The number in parentheses is the nation's Nation Code.

Australia (66)

 * AF Small Arms Ammunition Factory No.1 - Footscray; Melbourne, Victoria; Australia (1888-1945)
 * AFF Small Arms Ammunition Factory No.2 - Footscray; Melbourne, Victoria; Australia (1940–Present)
 * CAC Colonial Ammunition Company - Auckland, New Zealand.
 * ICIANZ Imperial Chemical Industries of Australia & New Zealand -
 * MF Small Arms Ammunition Factory No.1 - Footscray; Melbourne, Victoria; Australia (1888-1945)
 * MG Small Arms Ammunition Factory No.2 - Footscray; Melbourne, Victoria; Australia (1940–Present)
 * MH Small Arms Ammunition Factory No.3 - Hendon; Adelaide, South Australia; Australia (1940-1945)
 * MJ Small Arms Ammunition Factory No.4 - Hendon; Adelaide, South Australia; Australia (1940-1945)
 * MQ Small Arms Ammunition Factory No.5 - Rocklea; Brisbane, Queensland; Australia (?-1945)
 * MW Small Arms Ammunition Factory No.6 - Welshpool, Western Australia; Australia (?-1945)

Canada (20 and 21)

 * DAC Dominion Arsenal Co. - Quebec City, Quebec; Canada
 * DAL Dominion Arsenal - Lindsay, Ontario, Canada (1914-1918)
 * DAQ Dominion Arsenal - Quebec City, Quebec; Canada
 * IVI Industries Valcartier Inc. - Saint-Gabriel-de-Valcartier; Canada
 * TR Dominion Rubber & Munitions - Trois Rivieres, Quebec; Canada.
 * VC Verdun Arsenal - Verdun, Quebec; Canada

South Africa (18)

 * U Government Factory - Pretoria - Pretoria, South Africa.

United Kingdom (99)

 * RG Royal Ordnance Factory Radway Green - Radway Green, Cheshire; England, United Kingdom.

NATO Manufacturers
The number in parentheses is the nation's Nation Code.

Germany (12)

 * DAG Dynamit Nobel A-G - Troisdorf, Rhein-Sieg-Kreis, North Rhine-Westphalia, Germany and Fürth. After 2002 RUAG Ammotec, Fürth, Bavaria
 * MEN Metallwerk Elisenhütte Nassau G.m.b.H. - Nassau, Lahn, Rhineland-Palatinate, Germany.

Greece (23)

 * EPK, GPC, or HXP (Pyrkal) Greek Powder & Cartridge Company - Athens, Greece. (1908-2004). Manufactures cartridges and disintegrating belt links.

Israel (31)

 * IMI, TK, or TKK Israeli Military Industries - Tel Aviv, Israel. Manufactures cartridges and disintegrating belt links.

Italy (15)

 * GFL Giulio Fiocchi Lecco - Lecco, Italy.

The Netherlands (17)

 * AI Artillerie - Inrichtingen NV (1679-1983) - Zaandam, Netherlands.
 * EMZ Eurometaal Zaandam NV (1983–Present) - Zaandam, Netherlands.
 * NWM Nederlandsche Wapen-en Munitiefabriek de Kruithoorn NV (1948-1998) - 's-Hertogenbosch, Netherlands

South Korea (37)

 * PS (Poong-San), Poongsan Metal Mfg. Co. Ltd. - Seoul, South Korea. Manufactures military cartridges.
 * PMC (Precision-Made Cartridges), a division of Poongsan Metal Mfg. Co. Ltd. - Seoul, South Korea. Manufactures commercial cartridges.

Taiwan (?)

 * TAA Material Production Center, 205th Arsenal, Kaohsiung, Taiwan. A sub-contractor for General Dynamics. They manufacture 5.56mm NATO and 7.62mm NATO cartridges.