East German DSU tug Donaccording to a CIA report dated 14 December 1953

An item reported that after 1 May 1953 was added to the fleet of the East German Deutsche Schiffahrts- und Umschlagsbetreibe (DSU) and stationed at DSU-Berlin the originally private owned side wheeler steam tug Don with as number 736 and horsepower 550hp.

Source
The report was published on www.archive.org, document number CIA-RDP81-01036R000100070044-6