The Mark 2 was utilized by the U.S. military as their primary fragmentation grenade from WWII to the Vietnam War and nicknamed the “iron pineapple”.
This example was the practice version of the Mark 2. It is the RFX Mark 21 Defensive Hand Grenade. Painted olive drab the original colour would have been light blue. The hole at the base has no thread as it would have been plugged with a cork. On the body is marked “R F X” and “1”. The top of the lever is marked “FUSE M205A1” (this is a practice fuse), “LS-4-7” and “7-53” (this is the date of manufacture July 1953).