![]() CB Curtis Bay Ordnance Depot (CBOD) (1917–1957) – Baltimore, Maryland.Conversion back to rubber tire production began in 1944. AO or KS Allegheny Ordnance Plant ( Kelly Springfield) (1943–1945) – Cumberland, Maryland Operated by Kelly-Springfield Tire Co., a division of Goodyear Rubber.Some cartridges with a single "5" were made in 1955. ![]() Most wartime plants were closed by the end of the war. The demand was so great for cartridges that most manufacturers just ground off the "3" on the "43" stamp to save time. World War II manufactured cartridges with a single "4" as the year of production were made in 1944. United States military cartridges US arsenals Early 20th century cartridges may have additional digits or a letter indicating the month or yearly quarter of manufacture.Ī letter, number, or alphanumeric code indicates the place of manufacture: Other codes may indicate metal suppliers (like France or The Netherlands) or the percentage of copper in the alloy the cartridge case is made of (like Poland and Germany). They can be together as two digits or opposite each other (i.e., the tens digit at 9 o'clock and the ones digit at 3 o'clock). ![]() The cartridge on the right has a Two digits are the last two digits of the year of manufacture. The left cartridge's headstamp says "FC 223 REM" which means that it was made by Federal Cartridge Co.
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