SEATRANS DA.
image by Ivan Sache, 2 December 2003
Brown gives the S flat top and bottom edges, while Mitchell shows a square S. Photographs of Trans Dania in September 2004 and Baltic News on 3 June 2003 confirm the funnel: its S is narrower than on the flag logo and overlaps the white bands more at top and bottom.
This funnel appears to be assigned to Trans Bay, listed in 1988–89 under the managed company Samiet Knardel.