1981 Mark Twain One-Ounce Gold Medal (rev)
(1207-9547)
Heritage Auctions (image); U.S. Mint (gold commemorative medal)
Heritage Auctions <a rel="nofollow" class="external text" href="https://coins.ha.com/itm/modern-bullion-coins/us-bullion-coins/1981-ms-mark-twain-one-ounce-gold-medal-ms66-pcgs-pcgs-population-50-46-ngc-census-29-36-/a/1207-9547.s">Lot 9547</a>, 13 July 2014