AMPHENOL 80C female panel mount connector. 80 series. 1 contact Requires 5/8 inchD hole, 5/8 inch behind panel depth.
AMPHENOL 1 CONTACT MIC CONNECTOR CABLE END 80M1
AMPHENOL 6 CONTACT MALE MIC CONNECTOR CABLE END 91MC6M1
This is an old Amphenol microphone connector series. The connectors are designed primarily for audio equipment but are used extensively on all types of portable equipment and test equipment.