The Hungarian paddle steam tug Cserhalom according to a CIA report dated 3 December 1953

An item reported that the Hungarian-Soviet Shipping Company (Magyar-Szovjet Hajozasi Reszvenytarsasag=Meszhart) possessed the coal fuelled paddle steam tug Cserhalom with a horsepower of 600hp (continue rating), earlier of the DDSG.

Source
The report was published on www.archive.org, document number CIA-RDP80-00810A003000260005-5