Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1119:
Description
1918, imperforate 50k violet and green with reversal offset overprinted on gum side, NH, VF and scarce error on rare stamp, C.v. $100 for a common stamp, Est. $150-$180 , Bulat #1075 var
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