Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 637:
1922, provisional overprint ”Bakinskoi P. K.” over reading down metal surcharge 66,000(r) on 2000r black and blue, light vertical fold, still no gum as issued, VF and very rare, this stamp was not officially issued, V. Zagorsky certificate, Est. $300-$400, Scott #333 var
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