Looks like pewter. I have no idea.
Smith & Wesson Model Revolver Vintage Tie Tack Lapel Pin e112
Osprey Bird English Pewter Tie Tac / Tack - XTTTB44
Running Pig English Pewter Tie Tac / Tack - XTTTA39
Fly Fisherman Pewter Tie Tac - XTTTF38
Lifeboat Pewter Tie Tac - XWTT138
Devil Pig (Boar) English Pewter Tie Tac / Tack - XTTTA69
