Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1064:
1918, black surcharge 25(k) on imperforated 2k green, basic stamp with double impression, bottom left corner margin block of four, surcharge positions 81-82/91 -92, marginal folds did not affect the stamps, full OG, NH or LH (top stamps), VF, I. Myaskovsky opinion, C.v.$600 as hinged singles, Est. $300-$400, Scott #7a
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