1890 United States Assay Commission Medal. By Charles E. Barber and George T. Morgan. JK AC-33. Rarity-4. Copper. MS-66 BN (NGC).33 mm. A fully struck, satiny Gem with rich autumn-brown patina throughout. The copper counterpart to the silver impression from these dies offered above, the reverse design of which features the Latin legend LIBRA PROBAT OPUS, or "The Scales Verify The Weight (of the coins)."Acquired from Steve Hayden, August 2009. Collect tag with provenance notation included.