This is the most collectable of the old style fifty pence pieces. Only minted in 1994, these coins commemorate the 50th anniversary of the Normandy invasion. 

The obverse of the coin bares the third crowned portrait of Queen Elizabeth II right, wearing the George IV State Diadem, and the engravers initials below (Raphael David Maklouf). The reverse of the coin has a beautifully detailed depiction of the D-Day landing, with a design representing the Allied invasion force of landing craft and aircraft heading for Normandy, filling the sea and sky. The reverse was engraved by John Mills, and his initials can be found in the wake of the lowermost landing craft.