Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1136:
1871 (August 7), entire folded letter from St. Petersburg to London, franked by vertical pair of 10k brown and blue on horizontally laid paper, arrived to London on August 23 (Gregorian Calendar), F/VF, Est. $100-$150, Sc. # 23
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