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James Dignan’s V51 comes from Sampson’s Dumpy Book, which likewise does not specify light blue. Brown 1958 shows the same version.
V245 represents an actual flag exhibited in Hamburg: celestial blue, edged white, with a white diagonal ribbon bearing red VDS. Schneider’s observation gives evidence for the later sky-blue shade.
Skipet’s five variants are V247, a dark-blue swallowtail with white VDS; V248, a square dark-blue flag with a white border and a white diagonal from the upper hoist bearing red VDS; V251, dark blue with a white diagonal and red VDS; V249, sky blue with a white border and diagonal, bearing sky-blue VDS separated by sky-blue dots; and V250, sky blue with a white border and diagonal bearing red VDS. No dates are assigned to the sequence.
Norske Rederiflagg 1952 supports the last Skipet pattern, but with a wider white band, represented by V246.
V129, from Brown 1951 and 1982 and Stewart 1963, is blue without a border and has a wider white diagonal band.