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

Imperial Russia

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Start price: $2,000

Buyer's premium:

1906, stage proof of 5r in dark blue (frame only), size 44x48mm, printed on chalk-surfaced paper without gum, VF and extremely rare, Est. $3,000-$4,000, Scott #71