Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 133:
1928 (September 30), Balloon ”Poznan” Flight cover to Warsaw, franked by definitive stamp of 5gr yellow green and perforate Balloon label of 1zl brown violet and blue, cancelled by red ”III Raid Balonow Kulistych” and ”Kuznica Grodz. 1.X.28” ds, in addition a single label with full OG, NH, both are VF, Scott #230
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