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A Century of Progress %u2022 Vintage PostcardsPhilately and the FairNew Postage StampsOriginally there were to be two versions of the 3%u00a2 Century of Progress stamp (for postcards) released for the Fair. The first was Scott #729 (plate number block at top), which was issued in 100-stamp perforated sheets on May 25, 1933; the second was Scott #731, an imperforate Souvenir Sheet issued on August 25, 1933 (above).
