sixpenny vs twopenny

sixpenny

adj
  • Worth six pennies. 

noun
  • A publication costing sixpence. 

  • A stamp worth sixpence. 

twopenny

adj
  • Having a value or cost of twopence. 

  • Cheap; worthless; petty. 

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