WWI Era HMS ROYAL OAK On Deck Photo. HMS Royal Oak was one of five Revenge-Class Battleships built for the RN during WWI. Completed in 1916, the ship first saw combat at the Battle Of Jutland as part of the Grand Fleet. Sunk by German U-47, 14 October 1939. Approx. 20.5 x 15.5cm. Some wear and tear, mainly to edging, see photos. UK P and P RM £2.50.