Föhrtmann & Behne - The company used a flag with three horizontal stripes
green over red over green with a white serifed capital "B" shifted to the
hoist.
Source: Jürgen Meyer: "Hamburger Segelschiffe von 1795-1945";
ISBN 3-89225-400-1; Hamburg 1999; inside cover.
Klaus-Michael Schneider, 2 Apr 2007
Föhrtmann & Behne - modern
image by Klaus-Michael Schneider, 2 Apr 2007
In the current flag the green has a blueish touch and the "B" is now
in the centre. The company might either be dissolved recently or it has
moved. I spotted this flag on 22 March 2007 on Vorsetzen (Hamburg).
Klaus-Michael Schneider, 2 Apr 2007