2020 Mongolia Plesiosauria 3 oz .999 Silver Proof Coin is ranked as the ideal PR70 by PCGS. This massive 65 mm 3 oz silver colored evidence features the Plesiosaurus. Pad printing has been applied to proof finish silver coin. The fossil is displayed in very high detail against a blue backdrop designed to mimic the rock in which these fossils were found. Item qualifies for Free Shipping.