It is the first collectable UK 50p to celebrate a royal event and was designed by artist John Bergdahl.

Marking 70 years on the throne, the coin depicting the Queen on horseback will be struck on the heads side of a new 50p and traditional £5 crown.

The Royal Mint said it is reminiscent of the equestrian designs for the 1953 Coronation and 2002 Jubilee crown pieces and has been personally approved by the Queen.

The Royal Mint's divisional director of commemorative coin, Clare Maclennan, said: "The Platinum Jubilee is an historic occasion and one that is particularly special for The Royal Mint, as the original maker of British Coins for 1,100 years.

"Designed by esteemed artists and made with original craftsmanship, Her Majesty's Platinum Jubilee coins are enduring pieces of art that will be collected, cherished and passed down for generations."

Royal Mint Museum historian Chris Barker added: "The Queen's legacy on coins stretches the length of her momentous reign, with The Royal Mint striking five definitive portraits of Her Majesty on official UK coin and celebrating previous Jubilees.

"Today's launch marks another significant milestone, and The Royal Mint plays a proud part in the nationwide celebrations."