PRINCE George of Cambridge's first birthday is to be marked with a commemorative £5 coin.

The Duke and Duchess of Cambridge's son is the first member of the royal family to have his first birthday honoured with a new coin.

William and Kate, along with George's great-grandmother the Queen and Chancellor George Osborne approved the design of the sterling silver piece, which bears the heraldic royal arms and the year 2014.

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Third in line to the throne and future king George turns one on July 22. There will be a limited mintage of 7,500 of the birthday coins, which will cost £80 each. The heraldic royal arms was originally created for the Queen and was last used on a coin struck for the British Exhibition in New York in 1960.