This is an original, used horn relay for GM cars. This would be for the following applications;
1966-71 Corvette
1967-69 Camaro
1966-71 Chevelle, Malibu, El Camino
1966-71 Chevy II Nova
1966-70 Impala, Caprice, Biscayne, BelAir
1967-68 Firebird
This one has been tested. The screw hole for the bottom tab has been broken off.