The rear center pull brake was damaged. The cable retaining back side broke off and the front side was drilled out for a quick short term repair. The PO stated he was not able to find a replacement brake lever arm. I fear I won't be able to find one myself. Didn't realize these Gran Compe 450 center pull brakes were rare and expensive.
Maybe I can find out what type of alloy they were made from and repair these myself.