Great replacement for your Mongoose seat clamp. I believe this seat clamp is a 1980 but it was made from 1976-1982. It is new. This is NOT a repop  It comes with the 6 dash bolt and both nuts in the pictures. Bolts and nuts are also same time period. All parts are in great shape. There is no markings or manufacture stamp. Seat clamp has the square hole that the square shaft on the bolt matches up to.