Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 147:
1930 (September 23-25), Baltic Sea Flight two covers, franked by three or two air post values, tied by Romanshorn ds, green confirmation cachet and drop of Tallinn and receiver of Kuopio (Finland), mounted on pages from a Collection, VF, Sieger #88B, C, C.v. €240 without a premium for franking, Scott #C9/15
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