Original U.S. WWI Extremely Rare Inert Mk. I Defensive Grenade with Original Fuse and Lever OPTIONS_HIDDEN_PRODUCT an 8th Air Command patch

an 8th Air Command patch on his left shoulder

Nearly identical Police swords will have a Police badge on the back of the pommel and a five petal cherry blossom on the "ears" of the backstrap

The treatment used on the wood often made it brittle

sure to look fantastic hanging on the wall

Original U.S. WWI Extremely Rare Inert Mk. I Defensive Grenade with Original Fuse and Lever OPTIONS_HIDDEN_PRODUCT an 8th Air Command patchOriginal 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.