Welcome To YEAR1cycles.com Specialist Campagnolo
Campagnolo DELTA Brakes.
These are the 3 pivot version see pic above.
This particular set were in a nasty condition due to the owner storing the bike away in a damp room.
Setup of these brakes is critical as any out of place pivot or brass washer can affect the capabilities of these beautiful made brake systems.
The process to clean and bring back to new is very lengthy and spares can be very very hard to get.
Please contact YEAR1 for info concerning any overhaul to this brake type.