Bidspirit auction | Imperial Russia - Ship Mail

Imperial Russia - Ship Mail - 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