1924 (Dec): National Aviation School. Perkins Bacon Airmail 10 c. vermilion & black, an unused block of four, marginal from left of sheet, variety "Centre Inverted", minor perf. splitting between stamp and margin, three stamps unmounted og. Just 50 examples printed. Superb and of great rarity to both the Bolivian and the Airmail specialist Gi 170a = £ 11'000/Scott = $ 10'000.
Katalog 265: EUROPA & ÜBERSEE
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