hair's breadth vs maravedi

hair's breadth

noun
  • A very small amount or distance. 

maravedi

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

  • A former Spanish coin and unit of currency, originally issued in gold but later in silver and copper, discontinued in 1848. 

How often have the words hair's breadth and maravedi occurred in a corpus of books? (source: Google Ngram Viewer )