Might be this former danish lightship:

Motorfyrskib No. II

- active lightship from 1916 until 1978
Length: 33,58 m
Beam: 6,82 m
Depth: 3,47 m Displacement: 342 t
Shipyard: Rasmus Møller Værft, Fåborg, Denmark
Year of construction: 1916
Populsion: Two Cylinder Two Stroke Engine 125 HK
Anchor: mushroom anchor, later Patent anchor
History:
1917-1920 Gilleleje Flak N. station
1920-1927 Grådyb station
1927 Horns Rev station
1930-1939 Vyl station (40 km west of Esbjerg)
1946-1947 SW 1 station (40 km west of Thyborøn)
1947-1969 Vyl station
1978 sold for 31,000 DKK by auction to the Dragør Sailing Club. They restored the lightship for 500,000 DKK and used it as a club ship. After some years the ship was economically not longer viable for the club
1985 in January sold for 500,000 DKK to Arp Hansen, who is the owner of the Nyhavn Hotel in Copenhagen. Today the lightship is a summer restaurant ship in the Nyhavn in Copenhagen
End of the 90ties sold to a new owner
29.09.2006 The lightship was towed away from Copenhagen by a tug from Poland. It is said, that it is in Poland for overhaul today. Who knows more?

http://www.feuerschiffseite.de/SCHIFFE/DAENEMA/MFS02/mfs2gb.htm

Regards, Frank

Polsteam , what more do you know about this sunken danish lightvessel ?
Regards,
jaap termes