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 "American Colortype Company". The reverse side features a postcard format, which is unused and a paragraph that says "An exhibit demonstrating the basic principles of Light and Color and the relation of each to Color Excellence in Engraving and Printing" and measures approx. 5 1/2" x 3 1/2".