Bank of England 10s note pence coin was introduced as a replacement for the ten-shilling note. The principal reason for the change was economy: the notes had an average lifetime of about five months whereas coins could last at least fifty years. The series C ten shilling notes ceased to be legal tender on 22 November 1970. In the Isle of Man, both the English and Manx Ten Shilling Notes continued to be legal tender for fifty new pence until 2013. Information taken from Bank of England website. Bank of England 10s note The Bank of England 10s note was a banknote of the pound
Legal tender banks authorised to issue bank notes must redeem them on demand for gold (the gold standard). In 1933, the Coinage Act created a specific New Zealand coinage and removed legal tender status from British coins. In the same year the Reserve Bank of New Zealand was established. The bank was given a monopoly on the issue of legal tender. The Reserve Bank also provided a mechanism through which the other issuers of legal tender could phase out their bank notes. These banknotes were convertible into British legal tender on demand at the Reserve Bank and remained so until the 1938