Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 877:
1912-16, 20k blue and carmine, 50k lilac and green, two stamps in blocks of four, each one has background additionally printed (not offset) on gum side, nice and fresh, full OG, NH, VF, stamp of 50k with this variety is really scarce, Est. $200-$250, Scott #82, 85 var
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