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Senegal December 29, 1925 - January 6, 1926, First Experimental Airmail/Auto Cover Dakar - Zinder (Niger), carried by rail from Dakar to Bamako, then by air from Bamako to Niamey, and by car from Niamey to Zinder, mixed franking with Senegal 30c black and rose and pair of Niger dues of 10c carmine, five-line confirmation cachet, large pre-printed "Par Avion" and all appropriate markings, VF
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| Scott # 93