1.236″ high x 1.495″ wide x .143″ deep. 18 1/2″ chain. All brass nickel plated. Push key. The key cannot be removed when in the open position. Original key. Picture of Columbus is on the obverse of the body. “PAT.AUG 4th 91” is stamped on the reverse of the body. Commemorates the 400th Anniversary of Columbus Discovering America. “The World’s Columbian Exposition” was the title of the 1893 Chicago Illinois World’s Fair. Patent Not Found.