This is a Model 1 that replaced my original 1962 one that I carried in Germany. It was lost by a friend KIA in Quang Tri.
There are two 20mm cases, headstamped "1944" and one 37mm stamped "1943" and marked "SHOT.APCM51". These brass cartridge cases were picked up by my father on Corregidor in 1945. Another one (not shown) is stamped "1928" with a primer marked "1934"; that's how pittifully ill- prepared we were then for the outbreak of WWII.

Regards, Neil Tucson, AZ