[3] By the Treaty of Versailles the navigation on the Oder became subject to international agreements, and following its articles 363 and 364 Czechoslovakia was entitled to lease in Stettin (now Szczecin) its own harbour bassin, then called Tschechoslowakische Zone im Hafen Stettin (German: the Czechoslovak Zone in the Port of Stettin).

[4] The contract of lease between Czechoslovakia and Germany, and supervised by the United Kingdom, was signed on February 16, 1929, and would end in 2028, however, after 1945 Czechoslovakia did not regain this legal position, de facto abolished in 1938/1939.

In 1945, after Soviet capture of the German city and hand-over to the Polish on 5 July 1945, the port remained under Soviet control, and it was to take until 1955 that Poland would obtain complete authority over the port.

Particularly, in the Stettin area, parts of paper manufacturing plants from Stolzenhagen (today: Stołczyn) and Scholwin (today: Skolwin) as well as the Stoewer vehicle plant were dismantled and shipped via the port.

The reason was that because inter-war Poland had only a very short coast, there were not sufficiently many Polish harbor specialists to operate the port.