Dating cartridge headstamps

LM = Lowell Ordnance Plant - Lowell, Massachusetts. Headstamp images are approximately 2.3x actual size.M = Milwaukee Ordnance Plant - Milwaukee, Wisconsin. 1942 1943               1943               1943 1944             1944               1944   1945               1945 19391940               1940 1941               1941  1942               1942  1943               1943 1944               1944 Several inquiries as to this round, which at first glance appears to be a .50 caliber, prompted a mention of it here for collectors.So, it is no wonder that a single-based nitrocellulose powder was soon invented, the all-Italian "Solenite".


The codes consist of one, two or three digit factory numbers, sometimes there are 5-point communist stars at the 3 o´clock and 9 o´clock positions, especially in the calibers 12,7mm and 14,5mm. When 21 was used, the year was stamped upside down.Romania used 15, 21, 22, 321, 322, 323, 324, 325 and RPR, PA, CMC Heavily used Russian state factory numbers are: 3, 17, 188, 606, etc. Between 19 the date on Russian headstamps was not given as a number but as a single upper case letter.


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