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Sometimes, the envelopes in the Alexander collection were affixed with stamps that are interesting in their own right, and not just as representing the payment for the shipment. One of the items kept in the collection is an example of the technical errors that were involved in the printing of the stamps used during the British Mandate period, and illustrates the way in which these errors help to locate the original position of the stamp in the complete stamp sheet.

On December 11, 1959, the Malian Federation Post issued its first airmail stamps.