Aluminum pulley for the crankshaft of a Y-block with a LATHAM supercharger. weathered,corroded but the real thing.This disappeared from my "stuff" about 45-50 years ago. I eventually got rid of the Latham. I recently found it in my old hometown at a yard sale mixed in with some other parts. It is 10.5 inches in diameter,carries a 2 inch wide belt. it has a hub for a Y-block crank and 3 bolt pattern. Pictures sent to your phone. $150 shipped firm. contact me at : carl [email protected]