Great Central Fair, Philadelphia, 20¢ Green (WV12), well-centered, rich color, tied by "Great Central Fair. June 28, 1864" circular datestamp on the last day of the fair, second strike also ties stamp on immaculate cover addressed to "Mr. Kline, Central Fair", probably A. C. Kline, a pioneering Philadelphia stamp and coin dealer who must have been keenly interested in the Sanitary Commission post office at the Great Central Fair, Extremely Fine, easily one of the finest of the fewer than 20 recorded covers bearing stamps of the Great Central Fair, ex White (1937 sale), Steele and Kantor (illustrated in their book, fig. 114)

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