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

Imperial Russia

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Start price: $1,000

Buyer's premium:

1908-09, die proof of 5k in bluish green, printed on thin cardboard, size 33x39mm, no gum as produced, VF and very rare, Est. $2,000-$2,500,Scott #77