Greek Military surplus, made in 1970. H is for Hellene
Practically speaking, a good aircraft headset is the one you're wearing, because it's much better than no headset at all... especially if it works. But if you're looking for an upgrade, at around $1100 per copy, the Bose A20 is probably the best, most advanced aviation headset you can buy. Other brands include the David Clark Model H10-56 HXL/HXP, the Sennheiser S1, and the Plantronics MS260; all great brands with cutting edge electronic and acoustic technology. More modestly priced headsets are available from all four manufacturers.
If your wondering what it will show up on a drug test here is what I know! I was in a program that tested my urine once a week. I was being tested by a normal five panel dip stick, meth, coc, THC, opi, Benz, and when i was being tested i was passing drug test while on Oxycontin. It wasn't until the program director figured out that Oxycontin didn't show up on a drug test that he had to special order "oxy" test strips. And the same is for percocet also. So I hope that helps answer your question a little. HXP It metabolizes into noroxycodone and oxymorphone.