Cameroon 1915 2d on 20pf ultramarine surcharge error, SGB4a

Cameroon 1915 2d on 20pf ultramarine, SURCHARGE DOUBLE, ONE ALBINO, with the albino impression 2mm below the inked impression and very clear, SGB4a.

A brilliant quality mint example with original gum.

A very rare error as only one half sheet of 50 originally existed with much fewer examples surviving. The first time we have handled this interesting 'Cameroon Expeditionary Force' issue error.

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