This original postcard is from the 1933 Century Of Progress (Chicago World's Fair) which was held in Chicago. It is in good condition but is yellowed and has slight wear especially alongside the right side and a piece missing in the lower right hand corner and the front features the "Owens-Illinois Glass Block Building". The reverse side features a postcard format, which is unused and a paragraph that says "This is the first full-sized structure built of glass block recently perfected by the Owens-Illinois Glass Company" and measures approx. 5 1/2" x 3 1/2".