This original postcard is from the 1933 Century Of Progress (Chicago World's Fair) which was held in Chicago. It is in very good condition with slightly worn corners and the front features the "Electrical Group By Night". The reverse side features a postcard format, which is unused and a paragraph that says "Showing a small section of the Electrical Group, which consists of three sections located on Northerly Island." and measures approx. 5 1/2" x 3 1/2".