Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1062:
1908, perforated proof of 10k in blue, printed on wove paper with varnish lines, each stamp has 3 instead of 2 lines of inner oval and with top ribbon curls different from issued stamp, side margin horizontal strip of four with gutter in the middle, right stamps are placed upside down and forming tete-beche pair, no gum as produced, VF and extremely rare, only a few survived, Est. $10,000-$12,000, Scott #79
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