Genuine U.S. Vietnam War era AN/PRR-9 Receiver & AN/PRT-4A Transmitter. These radio sets were first sent to Vietnam in 1967 for use in the field, due to the range performance vs the PRC-25 radios these sets were eventually used for base security, additionally these sets were also used by recon teams in 1968. The AN/PRR-9 unit is a M1 helmet mounted receiver with an ersatz wire antenna, this unit is in good condition with hand notation service/issue numbers, retains original antenna. The AN/PRT-4 handheld transmitter is a walkie-talkie style radio that works in conjunction with the AN/PRR-9, the transmitter is in good condition, the tone/voice selector switch has some damage to the bottom section. It features a telescopic antenna and two channel switching, was made by Delco Radio Division G.M.C and has a U.S. contract number dating it to 1967.