Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 874:
1917, 10k dark blue, four perforated stamps, including print on gum side, ghost double impression and horizontal pair with full offset on reverse, full OG, print on gum side with slight trace of hinge on ungummed side, VF and a spectacular unit, Est. $200-$250, Scott #79 var
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