Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2

Imperial Russia

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Start price: $5,000

Buyer's premium:

1908, perforated proof of 10k in blue, side margin horizontal strip of four with gutter in the middle, right stamps are placed upside down and forming tete-beche pair, printed on wove paper with varnish lines, no gum as produced, VF and rare, Est. $10,000-$12,000, Scott #79