Original U.S. WWII Brass M2 Pyrotechnic Pistol by International Flare-Signal Co. Serial 583 U.S. Grenades are of one inch bore

are of one inch bore (26

The flag is marked on the header with the Eagle / M indicating German Kriegsmarine (Navy) acceptance

- 2 barrel bands

They remained in use for over 200 years

Original U.S. WWII Brass M2 Pyrotechnic Pistol by International Flare-Signal Co. Serial 583 U.S. Grenades are of one inch boreOriginal Item: Only One Available. Well this is something that we have only had once before! Most are familiar with the large 37mm Signal Flare pistols made by International Flare Signal Co., but this is a much smaller "M2" model, with a frame and 2 1 4" "barrel" made entirely of brass. Instead of having a breech that opens, the flare on these are muzzle loaded, with the rim of the casing held in place by a brass latch on the left side of the pistol.