Original U.S. WWI Extremely Rare Inert Mk. I Defensive Grenade with Original Fuse and Lever Russian Maxim 1910 firing as they retreated

firing as they retreated

though it is stretched taut over the front brim due to the leather shrinking

There are just a few tiny moth nips on the cap

The introduction of tanks on the battlefield helped to break the stalemate and static lines that resulted from Trench Warfare

a sharp tug on the tear-off tape would create friction between the chemically-soaked end of the tape within the cap

Original U.S. WWI Extremely Rare Inert Mk. I Defensive Grenade with Original Fuse and Lever Russian Maxim 1910 firing as they retreatedOriginal 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.