It is a bullet all righty
a "bullet catch"
DUH ! you see it was found in a cigar box of old loose cartridges , owner swore it was A BULLET.
There were some cool real bullets among the 22 Longs ....some rimfire 32's an old balloon case 44
saw some military rounds too
It may have been a prank or maybe someone really though is was some rare round ...muhahahahah