The pre-decimal threepence (3d), usually simply known as a threepence or threepenny bit, was a unit of currency equalling one eightieth of a pound sterling, or three pence sterling. It was used in the United Kingdom, and earlier in Great Britain and England.
Maundy Threepence have been issued for centuries (they are still being struck today for ceremonial purposes), and initially the circulating threepence were identical in design. Starting in 1927, they were made different - first with a design featuring three oak sprigs then one with a Tudor Rose, while the Maundy threepence continued with the traditional crowned numeral reverse.
By the end of King George V's reign the threepence had become unpopular in England because of its small size, but it remained popular in Scotland. It was consequently decided to introduce a more substantial threepenny coin which would have a more convenient weight/value ratio than the silver coinage. During the reign of King George VI, this new twelve-sided nickel-brass threepence format took over the bulk of the production of the denomination, being produced in all years between 1937 and 1952 except 1947. The reverse design during his reign showed a thrift plant.
For the reign of Queen Elizabeth II, this final reverse type, featuring a portcullis, was introduced. It was issued until 1970 (with only proof coins in 1970, as decimalisation was already under way at the time). Threepence coins issued in 1961 circulated for ten years until "Decimal Day", 15 February 1971, and ceased to be legal tender after 31 August 1971. Unlike some of the larger denominations, they were not re-denominated to a decimal value when the decimal Pound Sterling was introduced.
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