History of Aviation, Rare Stamps and Postal History of the World, Part 1
Lot 92:
1933 (August 25), Balloon ”Hamburg” Flight special postcard, addressed to Hamburg, franked by Frederick 6pf green, cancelled by Ruckenwaldau date stamp, semi-official Balloon Post 30pf red tied by special marking in blue, VF, Est. $100-$140
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