The Coat of Arms of city of Posen (now Polish city of Poznan). The boat was called "U-Posen". The emblem shown on the boat was a version of the Coat of Arms that did not have the angels nor the crown above the shield. The version shown here is closer to the one used on the boat.

Emblem image: Wikipedia Commons.

Keywords: coat of arms,posen,poznan,shield,castle,keys,eagle

1 U-boat displayed this emblem
U-436.