SCHIFFS- UND BOOTSWERFT GEBRÜDER SCHÜRENSTEDT K.G.
image by Klaus-Michael Schneider, 2 July 2012; observation 28 April 2007
The flag is blue with a white-edged red lozenge containing white GSB, the S twice the height of the other letters. Schneider records seeing an image at Hamburg’s Turmweg flea market on 28 April 2007.
Nüsse shows two table-flag variants. Rosanoski records light blue as 120-189-227 and medium blue as 043-082-173, without assigning those numerical values individually in the text.