1999年蒙古「千古天才系列」500图格里克双金属币,达文西像,重25克含.925银,含银量0.76安士,NGC PF69 Ultra Cameo,编号6136980-006。 Mongolia, bimetallic 500 Tugrik, gold plated silver centre in silver ring, 1999, Genius of the Millenium, Leonardo Da Vinci at centre, weighs 25g containing .925, ASW 23.1g (0.76oz),NGC PF69 Ultra Cameo, #6136980-006.