Vietnam era Doppler radar control head APN-175 as used in C-130, CH-3B, HH-3E and MH-53 airplanes and helicopters. On the Jolly Green giant these ones went almost in the middle of the lower center console between the pilot and co-pilot seats. Great shape I have a few of these available and all are in as nice or better condition than the one pictured.
As with any more relatively speaking) modern jet fighter parts I might have, sold to US buyers only and sold as a collectible only!