Though it is legal tender, the coin has been designed as a limited-edition collectable or gift and will not be entering general circulation.
The Royal Mint, which has marked significant royal events for centuries, will also make a 50,000-pound donation to the Duke of Edinburgh’s Award to support its community work in the U.K.
He was later transferred to another London hospital where he underwent a heart procedure, and then returned to King Edward VII Hospital where he stayed until his release.