That's probably an original, USA made unit that was turned in as a core back in the 80s or something. Better than new Chinese junk, though.

The vacuum port is for a vacuum assist line for the windshield wipers.

Last edited by Otto Skorzeny; 06/13/2023 1:20 PM.
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)