1896 United States Assay Commission Medal. By Charles E. Barber and George T. Morgan. JK AC-40. Rarity-5. Aluminum. MS-64 (NGC).33 mm. Pleasing silvery luster joins a bold strike. This is the only aluminum striking from these dies that we can ever recall handling and, in fact, AC-40 is unlisted in this metallic composition in the Julian-Keusch reference. The fact that this piece was once part of the collection of Chief Engraver Charles E. Barber suggests a special (perhaps unique) striking in a composition not made available to either commissioners or contemporary collectors.From our (Stacks) sale of the Collection of Charles E. Barber, Chief Engraver of the United States Mint, January 2010 Americana Sale, lot 4847. Lot tag included.