Delco-Remy Aircraft 12V / 12A Voltage Regulator as shown on photos. P/N 1118383C or 1118383 or 1118 383C.
Possible alternate P/Ns:
Delco Remy: 1118902 Electrodelta: VR300-14-12 DGR7-14-12 Cessna: 0413025-1
It was removed from a salvage aircraft.