The ship in the foreground is the Dutch steamer ABBEKERk (see previous photo
https://www.shipsnostalgia.com/gallery/showphoto.php/photo/1230933/title/abbekerk/cat/all), but I'm rather interested in the ship in the background with the doorkey as funnel emblem. The key may well point to the city of Bremen and indeed the port of registration seems to be Bremen. Which company used the key as funnel mark? The name of the ship is very short, probably 3 letters only.
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