Commonly used to hold 840 rounds of 5.56MM ammo, and various other goods, so the stenciling may be of other types of ammo. These ammo cans are from different parts of the military. Even though they may or may not say 50 Cal on the side of the can, they are indeed, empty 50 Cal ammo cans.
Grade of can will vary.
Pretty decent. They may have a little rust on the corners where the paint wore off. Also, some rust colored dirt, which I wiped away with ammonia cleaner. I wiped them down with WD40 afterward. The rubber is good.