The numbers are 1100310. I believe this is a Delco Remy Generator. I also think they stopped making these in 1964.
Delco Remy GENERATOR, Delco Remy Generator 1100310 Generator Chevy 4J29 Dated
Delco Remy GENERATOR, Delco Remy Generator 1100310 Generator Chevy Clean
Delco Remy GENERATOR, Delco Remy Generator 100018 3M4 Generator Chevy Gererator
NOS Delco Remy 1116896 1953 Buick Series 50 70 1954 70 100 Power Brake Relay
Chevy BBC 3 inch Offset Drive Delco Remy HEI Blower Distributor Standard Deck
Radio Noise Voltage Regulator Capacitor with Clips Delco Remy. 5mf 1964-74 GM
