Original U.S. WWII Inert MkII Pineapple Grenade with Yellow Ring & Fuze colts This would be read: SHOWA

This would be read: SHOWA (current reigning emperor) Juu Kyu Nen (19th year of reign - 1944) Ni Gatsu (2nd Month - February)

and all components are totally correct

Nothing suggests that there are real problems with fragmentation of these grenades (besides fragmentation pattern probably being very random - like in most hand grenades of the era) - on the contrary by end of World War 2 egg hand grenade 41 got replaced in production by quite similar egg hand grenade 43 and after the war they remained in use (equipped with new fuses) numerous decades

with the 4 groove rifling showing clear lands and grooves

of ROMANIA

Original U.S. WWII Inert MkII Pineapple Grenade with Yellow Ring & Fuze colts This would be read: SHOWAOriginal Item: Only One Available. Totally inert and demilitarized according to BATF guidelines with hollow body and inert fuse. This grenade cannot be converted to an explosive devise and is not available for export. This is an iconic U. S. fragmentation pineapple grenade issued during WWII. The Mk II was standardized in 1920 replacing the Mk I of 1917. It was phased out gradually, the U. S. Navy being the last users, on 2 April 1945 the Mk II and Mk