I bought one nonrunning for 450, sight unseen. OOps. after months I got it working and sold it goin maybe 20 for 350. That guy had it for sale 500 and i saw it again for 800, so I guess value's pretty arbitrary. It was the same model/color and at least same aesthetic condition -except not the mags. those brakes are (or were at least) hard to find.
I kinda love these but it's not super desirable