I'm pretty sure these are rebadged Sennheiser HD450IIs, a pretty nice consumer grade headphone from the early to mid 90's. Very solid packaging.
Sound is good; they were never $250 phones but they'll kick the spit out of cheap earbuds.
On mine, there were two issues worthy of note that I would like to have known about.
1. The foam that's on the *outside* of the actual speaker body (visible in the cutouts on the backs of the driver units in the photo) is aging and getting dry/delicate. I think it's mostly aesthetic, so whatever, but...
2. In the photo, you can see that the stereo end of the cord is a gold plated 1/4" plug. This is actually an adapter which is snapped onto the stereo mini plug that's formed into the actual cable end.