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This stamp issued by Yugoslavia in 1950 shows us a cargo vessel loading or discharging cargo alongside a quay in a port.
The funnel markings give that she is a ship of the Jugoslovenska Linijska Plovidba, Rijeka, some sources give that she is the HRVATSKA built in 1945 as the ST LAWRENCE VICTORY but the stamp clearly shows us a ship with a steel superstructure with a wooden wheelhouse, the HRVATSKA did not have a wooden wheelhouse, so I am sure she is not depict, by comparing photos on line of the Jugoslovenska Linijska Plovidba fleet I could not find a matching one. Mostly around the 1950s ships with wooden wheelhouses where not often more built, so it must be one around or before that time when the stamp was issued.

Yugoslavia 1950 5d sg 667, scott?
Source: Internet

Thanks to Mr. Dies van Nieuwenhuijzen who sent me a photo of the Jugoslovenska Linijska Plovidba ship UZICE, he believes she is depict on the stamp. By comparing the photo with the stamp I agree.
She has a wooden wheelhouse, her bulwark is extended before the superstructure and special her long ventilation shafts on both side of the wheelhouse, of which one is clearly visible on the stamp.
Built as a cargo vessel under yard 573 by J&S Schiffswerft, Hamburg for “Ozean” Dampfer AG, Flensburg, Germany.
? Launched as the SCHLESWIG-HOLSTEIN, not any sister ship.
Tonnage 2,745 gross, dim. 100.2 (lpp) x 13.8m.
Powered by one triple expansion stem engine manufactured by Hannoverische Masch. Hannover, Germany, ?hp, one shaft, speed 9.5 knots.
August 1922 completed.

1928 Sold to SA des Armateurs, Nantes, Rouen, France, renamed MATIGNON.
1933 Sold to Constants (South Wales) Ltd, Great Britain, not renamed.
1936 Sold to Brodarsko Akc Drustvo “Oceanica”, Susak, Yugoslavia and renamed PLAVNIK.
1945 Sold to Jugoslavenska Linijska Plovidba, Rijeka, Yugoslavia, renamed UZICE.
1955 Lloyds Registry gives her tonnage as 2,927 grt, 1,675 net, 3,780 dwt.
December 1961 arrived by the scrapyard of Brodospas, Split for scrapping.

Source: Lloyds Registry 1955/56. http://www.miramarshipindex.nz