brass farthing vs farthing

brass farthing

noun
  • Something worthless or of small value. 

farthing

noun
  • A very small quantity or value; the least possible amount. 

  • Former British unit of currency worth one-quarter of an old penny; or a coin representing this. 

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