Up for sale is a RC Allen Turn Coordinator Indicator RCA80-1   P/N C661003-0501. Technical info is as follows:

P/N: C661003-0501

Model RCA80-1

S/N: TC-1039

MODS: None.

Volts: 13.75  27.5 VDC

The unit was in working condition when removed.  If you have any questions, please feel free to ask! Happy buying!