Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1505:
1918, black overprints on imperforated 15k brown lilac and blue in vertical pair, top stamp has overprint type 2, bottom one – type 4, full OG, NH (bottom stamp) or LH, VF, and scarce, expertized by U.P.V., Bulat #1116b, no catalog value indicated, Est. $150-$200
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