Up for sale is a NARCO  NAV 825 TSO   Technical info is as follows:

P/N:  NARCO  NAV 825 TSO

S/N: 51975

MODS: 1

Volts: 13.75  27.5 VDC

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