Hitler Youth pennant commemorating Günther Prien. The pennant is embroidered with a picture of a U boat, a life buoy and the German naval ensign. It is inscribed: 'Prien' in white letters. On the reverse are the numbers '1501 75' and a lightning flash. The pennant is made of cotton with a crepe synthetic fibre used for the front panel. It is machine sewn. There are four loops of fabric for attachment to a lance at the hoist end. The item is a square shape with narrow pennant or schwenkel attached to the upper fly.

Günther Prien (1908-1941) was a U-Boat Commander and German national hero during the Second World War. A commander of U.47 he penetrated the British anchorage at Scapa Flow and sunk the 'Royal Oak' on 14 October 1939. U.47 was subsequently sunk with all hands by 'Arbutus', 'Camellia' and 'Wolverine' on 7 March 1941.

The pennant belonged to Vice Admiral Sir Peter Gretton (1912-1992), a gift from a friend who acquired it in Hamburg after the war. Gretton had been a convoy escort commander (B7 group) and had played a crucial role in the battle of the Atlantic.

The pennant would have been used by a 'jungenschaft' the smallest group in Hitler Youth — 15 boys aged 10-14. The group identification number is given on the reverse.