This original postcard is from the 1933 Century Of Progress (Chicago World's Fair) which was held in Chicago. It is in excellent condition and the front features the "Swift's Open Air Theatre". The reverse side features a postcard format, which is unused and a paragraph that says "Swift's Open air Theatre, where the Chicago Symphony Orchestra are presenting free concerts daily, under the direction of Frederick A. Stock, followed by noted guest artists." and measures approx. 3 1/2" x 5 1/2".