pinchbeck
Concise Oxford English Dictionary © 2008 Oxford University Press:
pinchbeck/ˈpɪn(t)ʃbɛk/
▶noun an alloy of copper and zinc resembling gold, used in watchmaking and cheap jewellery. ▶adjective appearing valuable, but actually cheap or tawdry.
– origin C18: named after the English watchmaker Christopher Pinchbeck.
'pinchbeck' also found in these Oxford entries:

