Alpaca
from the Antique Jewelry University
Alpaca (or alpacca) is an alloy of 65% copper, 19% zinc, 14% nickel and 2% silver. Alpaca, heavily plated with silver, is used in jewelry, flatware and hollowware.
Alternative names: neusilber, argentan, argentor, bendorfer silver, christoffel metal, packfung, peru silve, sterling metal.