1997 $100 Washington Mint Silver Proof- With COA

1997 $100 Washington Mint Silver Proof 4 oz Troy Silver W/ COA. 0.999 fine silver! Some signs of discoloration apparent in pictures but can be removed. The patina is the result from age. Patina - green or brown film on the surface of bronze or similar metals, produced by oxidation over a long period. Case and certificate of authenticity included! Please feel free to reach out with any questions:)