...did you know more about the units and the history? I was on bord at summer 2010 and could see the original drawings. It was build on a shipyard at Rügen as an "Luftsicherungsboot"
Kind Regards...

Old Danish Minesweeper, island (Ö) class. Built in 1941, ten units. All survived WWII and was used by the Danish Navy until 1965. Some units transfered to the Navy Guard where they were in service all up until 2004.