Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 62:
1920, 8 essay of Airplane surcharges on imperforate Hradchany stamps, inverted brown 14k on 500h, upright 28k/200h in dark lilac, red (2 – one with offset of the design on gum side), green, brown and black, in addition black 28k/500h, all with full OG, NH (1) or LH, VF and scarce group, each one expertized by Gilbert, Pofis C.v. CZK7,500=US$360, Scott #C1, C3
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