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

Russia and Soviet Union - Air Post stamps

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Start price: $750

Buyer's premium:

1961, Helicopter over Kremlin, black surcharge 6k on 60k ultramarine, right sheet margin horizontal pair, right stamp has no ”6” in surcharge variety, full OG, NH, VF and rare positional item, Est. $1,500-$1,800, Scott #C99, var