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

Imperial Russia

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Start price: $150

Buyer's premium:

1917, 10k dark blue, four perforated stamps, including print on gum side, apparent double impression and horizontal pair with full offset on reverse, full OG, print on gum side with light trace of hinge on front, VF, Scott #79 var