HOKUSEI KAIUN K.K.
image by Phil Nelson, None
For Sorachi Maru, the white funnel bands are separated by an equal-width gap, with a broad white ring around the central black circle and star. Alan Watt instead describes equal white-black-white bands with a thin white “O”; the US Navy shows them corresponding to the flag.
Phil Nelson’s FOTW flag derives from Stewart 1963 but uses unexplained 2:1 proportions.