by The Groninger-Lemmer Steamboat Company was founded on July 9, 1870 by the brothers Jan, Geert and Reint Nieveen. Initially, its steam ships maintained a regular service between Groningen, Sneek, Lemmer and from there on to Amsterdam and carried people, cattle and goods.
Towards the late 1930’s, the company had 27 ships and maintained daily service from Groningen with Sneek, Lemmer, Amsterdam, Zaandam, Rotterdam and Den Haag. In addition, its ships sailed directly from Winschoten, Scheemda, Zuidbroek, Hoogezand-Sappemeer and Martenshoek to Amsterdam (see postcard shown in Figure 1).
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In a 2019 NPV auction a cover from the Groningen IV was sold. It was dated 31 December 1944 and sent from Uithuizermeeden in the north of Groningen province. Apparently the letter was still in the envelope, because the auction description states the letter was about the Germans and difficulties because of the war.
Here is the cover:
