In 1970 (I think), Britain switched from the penny/shilling/pound system (12 pence in a shilling, 20 shillings in a pound) to the decimal system (100 pence in a pound, no shillings). Coins minted before that are no longer worth face value, as one new penny is equal to 2.4 old pennies, but for a period they were exchangeable (one shilling is worth 5 new pence, etc.)























