I am over the moon about these Koss 4AAA stereophones. They seem to have never been used. Came with the model 16-168 case, and all cords are pristine.
They sound amazing. I’ll include more photos, including of docs/inserts/adverts, in a comment.
The ear pads are intact and holding their oil fine. They’re pretty stiff, though, as they’ve hardened a bit over time.
I’ve heard you can use Lexol leather conditioner to soften the ear pads, but I’m scared to try. I don’t want to harm them.
What do you think?

Thanks. I’ve heard this particular conditioner is supposed to be good for vinyl, too, but that’s why I’m asking.
I’ve also heard wearing them a lot is meant to soften them (with the oil from your body, plus your body heat softening the oil in the pads), but I’m not sure about this. I don’t want to ruin them.
Thanks for the tip on new pads! That’s very helpful. I’m trying not to do that, but I’m torn between loving them so much I want to use them and loving them so much I don’t want to ruin them. If it gets to the point of me wanting to replace the pads, it’s super helpful to know I can. Thank you!!