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Lloyds 1912 shows the initial off-centre and the diamond’s top and bottom points askew, which Jan Mertens and Rosanoski consider printing errors; Lloyds 1904 and Loughran centre the “A”. A model of Sun XVI supports a diamond extending throughout the field, provided the model is accurate.

The Thames Tugs website instead places the diamond within the field, particularly at the sides, and colours the funnel band orange rather than the generally recorded red. Tug photographs suggest a broader main band and narrower white bands than A838. The colour photograph of Sun XVII could be read as orange or reddish-orange. The Sun XVI model adds further uncertainty with two orange bands against one red; a black-and-white Sunbird photograph shows black with a broad white band.

The Liverpool Chamber of Commerce chart of 1966 also places the diamond inside the field but gives a blue “A”.