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 "Intra-Mural Bus with Hall of Science in Background, Chicago World's Fair". The reverse side features a postcard format, which is unused and a paragraph that says "Within the Ground of the Exposition, Visitors are transported by a fleet of sixty semi-trailer type open buses, which accomodate 15,000 to 20,000 passengers per hour." and measures approx. 5 1/2" x 3 1/2".