I've come across an odd looking headset with the markings AES on it. The cups are not round sided but have completely horizontal and vertical sides/top. The top adjustable cup has the locknut as part of it with 2 set screws to hold its adjustment in place. I'd guess it is from the late 70's or early '80's.
Anyone familiar or ever heard of this? Made by AES? Anything?
Thanks in advance,
Eric curious Elman