I have found a number of different forms of these coupler pins. This is the first marked one I have found. Train cars used to be fastened together using link and pin couplers. Alot of fingers, hands and lives were lost using these things. Thanks for looking! DD.
Amazing! That's awesome that it has the B&O RR lettering on it. My parents have a large property that is directly adjacent to the B&O line in Martinsburg WV so I thought I might have a good chance to find some railroad debris. This was my FIRST dig and after a few aluminum cans I found this!