pinchbeck

On November 27, 1732, an advertisement ran in a British newspaper announcing that "the toys made of the late ingenious Mr. Pinchbeck's curious metal ... are now sold only by his son. . .." The Mr. Pinchbeck in question was Christopher Pinchbeck, a London watchmaker who invented the alloy that would be posthumously named for him. Although the metal is used as a substitute for gold, the word pinchbeck, which can also be used as an adjective, didn't acquire its "counterfeit" sense until the 1790s, over 50 years after Pinchbeck's death.