COIN collectors can use a free online calculator to work out how much old change is worth. Pre-decimal coins ... the British currency there were 12 pennies to a shilling and 20 shillings in ...

They were the same size and value as shillings and florins, so ran alongside them as "decimal twins". The 50p piece was introduced in 1969 and the 1p, 2p and half-penny coins were introduced in 1971.