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The chartered Simsmetal used this funnel with the Chandris flag in 1969–72. The blue shade and the shape of the S are assumed.

Other ships used a white flag bearing a green map of Australia with a stylised yellow S. Siam Venture’s monochrome photograph confirms the basic funnel design; the green is described as dark, while its S looks conventional from the starboard bow. Mitchell instead draws a large elongated S.

The later flag replaces the green map and yellow S with a blue map and orange S. Seijin Maru was reported with a dark-blue funnel, narrow black top and yellow stylised S, whereas Tompkins specifies the change to orange. The earlier S312 flag persisted for a time during the transition.