GEBRÜDER PETERSEN.

Jorge Candeias’s version is blue with a central white roundel, possibly edged black, and apparently red G.P. initials. Its source was initially unstated. A later response named Gustav-Adolf Wolter’s See und Seefahrt (1968), but Rosanoski reports that the flag does not appear there.

Lloyd’s 1904 and 1912 instead show a blue flag with a white circle and black G.P. letters. Rosanoski identifies another image on the FOTW page as belonging to Kohlenberg & Putz Seefischerei of Geestermunde, distinguishing its number 1879 from Petersen’s 934 in Lloyd’s 1912.