Russia: Russian Offices in China 1917 “7 Dollars” on 7r, surcharge inverted, MINT NEVER HINGED ORIGINAL GUM, extremely fine and fresh. Signed Mikulski and RPS (2014) certificate. A great rarity, ONLY ONE SHEET OF 25 ISSUED, very few known to exist in mint never hinged, in this condition we record only the famous unique block of four and this single. Yvert 52a unpriced.
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