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They will be handed out as change when customers make purchases and post letters over the Christmas period.
Some 9.6 million 50p coins will eventually enter circulation in line with demand.
London. The first coins bearing the likeness of Britain's King Charles III entered circulation Thursday, The Royal Mint announced.
The new 50 pence (60 US cent) piece features an effigy of Charles, who became king after the death of his mother Queen Elizabeth II in September.
The Royal Mint, official producer of UK banknotes and coins, is initially releasing 4.9 million of the coins via transactions made at the country's postal offices.
