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 "Electrical Group At Night". The reverse side features a postcard format, which is unused and has a paragraph that states "The Aurora Borealis in all its splendor pales into insignificance before the magnificent beauty of the Electrical Group at night" measures approx. 5 1/2" x 3 1/2"