Original U.S. WWI Extremely Rare Inert Mk. I Defensive Grenade with WWII M10A2 Fuze MG 42 Bolt & Barrel Assembly With the beaches secure

With the beaches secure

1939 is also stamped on both of the chin strap attachment bales

-Also included is a "Search Coil Alignment test Unit"(whatever that is) in bakelite housing with smart data plate

The machine embroidered breast eagle is originally applied by hand

Original U.S. WWI Extremely Rare Inert Mk. I Defensive Grenade with WWII M10A2 Fuze MG 42 Bolt & Barrel Assembly With the beaches secureOriginal Item. Only One Available. The Mk 1 grenade (sometimes spelled Mk I) is a fragmentation hand grenade used by American forces during World War I. According to its designers, it was to be the "simplest", yet most "fool proof", grenade ever made. However, some major problems appeared when the grenade was used in the field. It was retired from service before the war ended, replaced in 1918 with the improved Mk 2 grenade used through World War II.