Yes, it's almost certainly a 12v horn if it won't work on 6v. Cadillac switched to 12v in 1953 and used long, loud horns like that up into the 1960s. They called it a "Country Horn" because it's so loud.

Last edited by Peggy M; 03/25/2024 11:56 PM. Reason: fixed his "all caps" in part of the text
1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)