£110 - £150
WEST AFRICAN AIRMAILS - R.A.F. EXPERIMENTAL FLIGHT: 11 Nov 1925 env. carried on the R.A.F. experimental flight from Cairo to Kano and return thence to London, charged postage due of 2d. in UK. Note - Only 85 covers were flown on the return leg. Ex Sir A Cadbury (June 2005). Also 10 Oct 1937 test env flown on the 1st regular Lagos to Accra flight operated by Elders Colonial Airways a subsidiary of Elder Dempster Shipping Line.
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