Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1091:
Description
1910, violet surcharge (at bottom) 6k on 1k reddish brown, bottom left corner sheet margin block of six (3×2), imperforate at left and bottom, two stamps at lower row have double surcharge (second ones – at top), unused, no gum, F/VF and probably unique multiple, only a handful stamps with double surcharge recorded, C.v. $12,600 as singles, Est. $3,000-$4,000, Schmidt #13, M
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