1871 United States Assay Commission Medal. By William Barber. JK AC-10. Rarity-5. Without Directors Name. Copper. MS-65 BN (NGC).33 mm. Outstanding antique bronzed copper surfaces are richly original toned, with semi-reflective qualities in the fields on both sides. Virtually pristine, as befits the assigned grade, with a full strike and abundant eye appeal. Our offerings of AC-10 in copper have been few and far between over the years, and this Gem is among the finest that we can recall handling.From Heritages FUN Signature Auction of January 2013, lot 14745.