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In this postcard, you can see the Port of Rijeka, in Croatia. it used to be part of the tiny Free State of Fiume (previous town name of Rijeka) that existed between 1920 and 1924. After World War I, it was a buffer state between Italy and Yugoslavia. During its short existence, the free state saw various different governments, but finally became part of Italy.
Međimurje County is a region in Croatia, sometimes called Hortus Croatiae, "the flower garden of Croatia". Thus the motive.