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

Imperial Russia

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Start price: $3,000

Buyer's premium:

1908, perforated proof of 7k in light blue, side margin horizontal pair with 3 pearls at left on each stamp, printed on wove paper without varnish lines, no gum as produced, VF and very rare, Est. $6,000-$8,000, Scott #78