Campagnolo Record 10 Skeleton Differential Brakeset: Single / Dual Pivot - Black (EXC))
This is the black version of the Campy 10 speed "differential" brakes which matched a dual pivot front brake to a single pivot rear. This was done because 70% of your braking power comes from the front, and you simply don't need that much braking power at the rear. Single pivot made rear modulation a lot better, while saving 40 grams. Highly revered as some of the best brakes of all time, and they're getting tougher to find.
Excellent used shape. The undersides of the brake arches have some tire throw wear, but otherwise pretty minimal wear. Pads have ~70% life.