NITTETSU KAIUN K.K.

N231 is described as the original funnel, associated with Zuiko Maru in June 1962; Rosanoski later could not relocate that observation in the cited Watt letter. N232 appears on the same vessel in 1965. No flag change is mentioned, though adding edging would align it with N162.

Rosanoski questions the white flag with a broad blue stripe bearing the diamond and letter, regarding it as an apparent mistaken inference from the funnel band. Watt likewise queries white bands on the flag.

N752 is effectively the N268 funnel, with uncertainty over the blue shade. Rosanoski favours a shade consistent with N518 and suggests the website logo shows a darker blue flag field.

The light-blue funnel was reported on NSS Endeavour at Newcastle on 3 August 2006 and confirmed by an NSS Grandeur photograph.