

The sources differ over dots after the initials. Lloyd’s depicts a long pennant, while other references show a triangular flag. B590 is documented by Lloyd’s 1904 and 1912, Brown 1926 and 1929, and Talbot-Booth 1936.
From Brown 1934 and Talbot-Booth 1937 onwards, most references extend the white border to the hoist, making it continuous around the flag. A cap badge supports this version, although US Navy 1961 retains the earlier form. Rosanoski has no flag evidence for the later Kekonius operation.