Zanzibar 1866 India 4a green (die I) and 1873 ½a blue SGZ13,16

Zanzibar 1866 India 4a green (die I) and 1873 ½a blue, tied to piece by very fine complete strike of type Z2 'BRITISH P.O. ZANZIBAR/'B' in square of bars' duplex. Insignificant traces of toning mentioned for accuracy, still a lovely item. Usage of the 4a die I in Zanzibar is very scarce. Cancel. SG Z13,16

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