COMPAGNIE NATIONALE DE NAVIGATION (1).

The source dates C373’s use to 1879–1904 but does not identify the authority for that dating.

Armements Marseillais specifies a sky-blue funnel band, without saying that the flag’s blue is the same shade.

The original company appears to have been founded in 1879 by Marc Fraissinet. It served French Indo-China, ran New York sailings from 1886 to 1896 and an east-coast South American service in 1887–1891. It was wound up in 1904.

France, Marseilles.