1933 Century of Progress World's Fair Chicago. About 500 covers, including many cacheted FDC's as well as covers commemorating Opening Day, Closing Day and every conceivable "special day": just about every day of the Fair was dedicated to something, all to promote attendance and create excitement; note many premium cachet makers such as Grimsland, Adam Bert (small covers), and many many more; closer examination recommended for accurate evaluation, please inspect (no photo). Estimate  $350 - 500. $0