Zanzibar (Postage Due) 1933 incoming airmail cover from Dar es Salaam underfranked at 35c. single rate, with blue endorsement Zanzibar (Postage Due) 1933 incoming airmail cover from Dar es Salaam underfranked at 35c. single rate, with blue endorsement

(Postage Due) 1933 incoming airmail cover from Dar es Salaam underfranked at 35c. single rate, with blue endorsement "over 1/2 oz./ T87 centimes" at lower left. On reverse arrival cds, with the double deficiency paid at the approximate conversion rate (87 gold centimes should properly have been 54 Zanzibar cents) by 1926-30 15c. black/orange corner vertical pair and 20c. black/orange and 1930-33 3c. black/rose tied by Reg Zanzibar cds. The 20c. due with corner faut, but a very rare and desirable mixed issue franking, with the 1930-33 3c. being one of just eight examples recorded on cover. Ex Griffith-Jones, described and illustrated on p 315 of his book.

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