I've recently lost my father in law and we're in the process of cleaning out boxes of crap he's collected over the last 3 decades.

I've come across a real, it's big, gold and marked with KAM500LD. I did a cursory google search but can't find anything on it (that's in English)

Any of you good folks heard of or know if its worth keeping, throwing out or selling?

Thanks, panic