Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 589:
1922, provisional violet overprint ”Baku” over inverted black surcharge 50,000(r) on 3000r brown and blue, Baku postal cancellation, mostly VF, used stamp is a rarity, several experts’ hs on reverse, guaranteed genuine, Est. $1,000-$1,500
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