Autographed (or not) postcard of Heinrich Lehmann-Willenbrock - the captain of the famous U-96 (but also U-8, U-5 and U-256). 
Received Knights Cross with Oak Leaves after his 8th patrol on 31 Dec 1941. 
In 10 patrols his crew sunk 25 ships  (179,125 tons) and damaged 2 (15,864 tons). After that he became U-Boot flotilla commander and survided the war to live until 18 April 1986.