I admit I haven't seen everything, some things slip by me, and some I just don't notice, but I picked up a dummy grenade today that has me a little puzzled. Nothing peculiar about the overall design, but if you notice behind the saftey pin at the top of the grenade, the word "KOREA" has been cast into the metal at the time of production. There are no other manufacturer's stamps on the grenade. I know the Mk II saw heavy use in Korea, but were the ones made at that timeframe marked this way? Is it a common item and it just took me a lot of years to notice one?