Original U.S. WWI Extremely Rare Inert Mk. I Defensive Grenade with Original Fuse and Lever Books & Films both are clearly marked with

both are clearly marked with the Divisional Insignia of the 27th "New York" Infantry Division

This is a dummy piece and is not filled with any explosive content

the re-siting of the fuel tank and ease of transport

The interior of the helmet still has an original M31 leather liner with all eight fingers still intact

The poster is missing much of the top left corner as shown

Original U.S. WWI Extremely Rare Inert Mk. I Defensive Grenade with Original Fuse and Lever Books & Films both are clearly marked withOriginal 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.