of a piece vs unbroken

of a piece

prep
  • Used other than figuratively or idiomatically: see of, a, piece. 

  • Of the same kind. 

unbroken

adj
  • Whole, not divided into parts. 

  • Of a horse, not tamed. 

  • Continuous, without interruption. 

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