Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 49:
1963, First Flight from Conakry to New York, inverted or doubled black overprint on 200f emerald, brown and lilac, two complete sheets of 20 (4×5), full OG, NH, VF, Est. $150-$200, Scott #C53 var
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