... I found a half-dozen pair of good sounding 1/8" plug headsets. Then at the bottom of one box, two sets of years-old Koss Pro4AA headphones. Great sounding cans at high volume levels but very heavy. Contributed a bunch, I'd imagine, to the hearing loss I've suffered over the years.
I wore these almost exclusively from 1970 to more than twenty years later.
I've messaged Koss in Milwaukee to see what the cost of refurbishing them is. And I ordered a six-pack of adapters to plug them into those teeny little headphone holes in current gear.