

From €1.50. Free shipping from €40 in France.
Black and white view of Duisburg harbor with flat-bottomed boats moored, cranes, and an industrial building on the left. On the reverse, the publisher Paul Gengross, Duisburg, and the serial number 376 are printed vertically. A German postmark from 1920 (P.Q.D.) is affixed at the bottom left, with the cancellation '34557'.