This is an aftermarket reproduction thermostatic fan clutch for all 1960-1963 Cadillac models with factory-installed air conditioning, plus 1964 models with engine serial numbers before 116400. You can find the serial number on the left side of the cylinder block above the edge of the oil pan.
Cadillac Model Years
1960, 1961, 1962, 1963, Early 1964
GM Part Number
1482704 Group 1.050