1870 United States Assay Commission Medal. By William Barber. JK AC-8. Rarity-3. Copper. MS-65 BN (NGC).33 mm. Rich mahogany bronzing to fully impressed, satiny surfaces. Free of all but a few faint traces of carbon, and solidly graded at the desirable Gem Mint State grade level.From Heritages FUN Signature Auction of January 2013, lot 14743.