The Polish motor tug B 65 type according to a CIA report dated around 1955

In a report titled Shipbuilding in Poland 1945-1955 were several series of ships described built by Polish shipyards including the motor tug type B 63 with a service speed of 8,5 knots, a horsepower of 180bhp/315 rpm and as dimensions 15,00 (between perpendiculars)-16,62 (over all) x 4,20 (moulded) x 2,20 (depth to main deck) x 1,45 (draught) metres or 49’3”-54’6” x 13’9” x 7’3”x 4’9”.

Source
The report was published on www.archive.org, document number CIA-RDP80T00246A003600560002-9