Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1165:
1910 (October 1), cover mailed from the board of a steamship ”Blagoveschensk – Nikolayevsk”, addressed to Switzerland, franked by 10k light blue, tied with oval steamship ds, arrival marking on reverse, VF and scarce, S. Sismondo certificate, Est. $400-$500, Sc. # 79a
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