Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 971:
1925, Esperanto Congress, 14k blue green and violet, horizontal pair with gutter between stamps, control markings on the gutter, unfolded and post office fresh, full OG, NH, VF and very rare, Est. $4,000-$5,000, Scott #348 var
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