Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 523:
1922, Provisional violet overprint ”Baku” over inverted black re-valuating surcharge 50,000r on 3000r brown and blue, Baku postal cancellation, mostly VF, used stamp is a rarity, several experts’ guarantees on reverse, Standard Cat. #26, $1,500 for an unused example, and not priced in used condition, Est. $500-$600
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