http://www.invaluable.com/auction-lot/1913-21-20s-purple-black-on-red-block-of-four,-889-c-5d9498ab1a1913-21 20s purple & black on red block of four, crossed by blue crayon & cancelled by Accra double ring d/stamp. A fine commercially used multiple. Rare. SG.84, Cat. £480
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