1876 Official Centennial Exposition Medal MS63BN. Julian CM-11. 57.7mm. Bronze. Chief Engraver William Barber designed this beautiful mahogany-brown medal. Check out all the great US Coins, Currency, Ancients, World and Exonumia at Sarasota Numismatics. We are happy to answer any questions you may have about this or any of our other extensive offerings.