LÜBECK LINIE A.G.
image by Klaus-Michael Schneider, 13 June 2007
The white flag has two red horizontal stripes, each doubled in width at the hoist to suggest LL. Mitchell dates his sighting to Seton in 1979.
The grouped variants retain the Flaggenbuch/Massary, 1937–38 and Stewart 1963 evidence alongside the later L523 sources.