Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 114:
BALLOON POST GROUP OF 7 ITEMS: 1899-1918, three civilians picture postcards, representing various balloons, franked by 5pf green, and four free-frank military balloon post No.40 (cover) or 206 (3 cards), mostly F/VF, Est. $250-$300
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