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 Sinclair Dinosaur Exhibit at the Century Of Progress Exposition". The reverse side features a postcard format, which is unused. This postcard has a paragraph on the back that says "The Dinosaur Exhibit built by the Sinclair Refining Company at the 1933-34 World's Fair in Chicago is the first attempt to recreate out-of-doors a portion of the earth's surface and animal life as they existed 100 million years ago. Brontosaurus reproduced life-size is the largest animated animal in the world. In life he bulked 40 tons and was 70 feet long". This postcard measures approx. 5 1/2" x 3 1/2".