Re: Mystery (to me) gun
It is possible that some previous owner removed the serial numbers and "US Property" stamps, so they would not get in trouble for having stolen government property. Problem is, it is illegal to own a gun that has had the serial numbers removed. It's not illegal to own one with no number. Lots of guns were made without numbers. Before 1968 it was perfectly legal to make a gun without a number. But it's illegal to have one that has had the numbers removed.
If it was me, I would never suggest that the numbers had been removed (which would make me in possession of contraband) but would tell people, if the subject ever came up, that it was a "lunchbox gun", which would explain the missing markings.
Meddle not in the affairs of dragons, for thou art crunchy, and taste good with catsup - George of Lod, Year of Our Lord 297
I always take precautions.
Beware the Evil Bullet Fairies.