I wanted a headset that was comfortable for long periods and didn't clamp my glasses against my head.
This RAF surplus headset met my needs and with the addition of preamp for the microphone it works fine with usb sound cards.
Getting the details was a bit of a phaf but i'll make proper circuit diagrams so I can do it again and hopefully i'll do a bluetooth version so when working around aircraft i'll be able to communicate effectively.
One of the funny things about these headsets is that their connector is very rugged and also rated for a specific disconnect force. Idea being the aircrew don't have to unplug they can just go and the headset will disconnect smoothly without tangling them and potentially trapping them in the aircraft.
The jack is allegedly NATO Type 671
The matching socket is NATO Type 626