Original Finnish Winter War Soviet Russian 50mm Mortar Head Converted Hand Grenade - Inert Flags & Signs and the top latch are

and the top latch are all marked with assembly number 436

There is a "3" on the back of the cylinder

There is no caliber marking present on the gritter guard

but still mostly legible

Helmet is steel construction

Original Finnish Winter War Soviet Russian 50mm Mortar Head Converted Hand Grenade - Inert Flags & Signs and the top latch areOriginal Item: Only One Available. This is a totally inert BATF approved grenade. This started life as a Soviet issue 50mm HE Mortar head which was captured by the Finns during the Winter War and converted to a hand grenade. Little is known about the improvised weapons, but today they are some of the most scarce of all WW2 ordnance. Like all deactivated ordnance, this grenade is Not Available for Export. The UZRGM (Universal'nyi Zapal, Ruchnaya