Well, it got here, and it has issues (no real surprise there).
There's a screw loose internally, quite easily visible when looking through it--it appears to be sitting on one of the internal elements. In addition, at least two of what appear to be o-rings are loose (possibly due to the screw coming loose. Finally, it feels a bit light to me, and when I look through it from either end everything is in focus on the other side at all times. In my previous looking-through-a-lens experience that has never happened--missing internal elements?
On the plus side, the glass I can see looks great, and there's no fungus. The lens barrel is a bit worn, as you'd expect for a piece of this age. I'll try mounting it on my K20D tonight and see what happens.