This is a Loran C Navigation unit that was sold back in the 1980's. These units have recently become obsolete due to the fact that Loran C navigation signals are no longer being transmitted by the U.S. Navy. Everyone has gone to GPS. loran loran c aircraft navigation Aircraft Loran C
This is a hard to find power plug that is used on the early Loran-C navigation units from the 1980s. The correct number is Amphenol 57-10140. loran navigation amphenol Loran Unit Power Plug