Postcard
Estimated value: $3-$8
In December 1928, Washington, D.C. was the epicenter of international aviation diplomacy, hosting the International Civil Aeronautics Conference as the United States sought to establish global air transport standards during the early commercial aviation boom. The commemorative stamps reflected America's ambition to lead the nascent aviation industry and promote cooperative international governance during a period of unprecedented technological optimism before the stock market crash.
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