This is a NOS Delco Remy single speed windshield wiper control switch. GM #1993543
Reported to fit the following Chevrolet vehicles;
1959-1963 Passenger (with 2 speed)
1959-1964 Biscayne, Brookwood, Bel Air, Parkwood, Kingswood, Impala, Nomad, Sedan delivery, El Camino and Corvette (with 2 speed)
1960-1964 Corvair with single speed washer
1961-1965 FC with single speed and washer
1962-1964 Chevy II, Nova with single speed and washer
1960-1963 Chevrolet Trucks with single speed and washer
1964 G10-G910 with single speed and washer