Brummagem vs pinchbeck

Brummagem

noun
  • A person from Birmingham. 

name
  • The city of Birmingham, England. 

pinchbeck

noun
  • An alloy of copper and zinc once used as imitation gold for cheap jewelry. 

adj
  • Made of pinchbeck. 

  • Sham; spurious, artificial; being a cheap substitution; only superficially attractive. 

How often have the words Brummagem and pinchbeck occurred in a corpus of books? (source: Google Ngram Viewer )