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A Century of Progress %u2022 Vintage PostcardsCelebrating 100 Years of Correspondence. An uncommon cachet by World Wide Cover. Cancelled on October 24, 1933. %u201c0004%u201d rubber-stamped on back.American Air Mail Society Convention.Cancelled on September 1, 1934 at the AAMS Convention Station, on the last day of that event. The AAMS was founded in 1923, and this was the organization%u2019s 4th convention.Philately and the FairCacheted Special-Event Covers