shilling sign vs sixpence

shilling sign

noun
  • The symbol '/' used in the United Kingdom before decimalisation to separate shillings from pence when writing out sums of money. (Examples: 7/6 = seven shillings and six pence; 7/- = seven shillings exactly.) 

sixpence

noun
  • A former British coin worth sixpence, first minted in 1551. 

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