1992年中国古代发明系列第一组「世界最早的造纸术」精铸银币3元,重15克含.900银,总含银量13.5克,NGC PF68 Ultra Cameo,发行20000枚。 Peoples Republic of China, silver proof 3 Yuan, 1992, weighs 15g containing .900 silver, ASW of 13.5g, Inventions and Discoveries, series I, Ancient Chinese Paper,NGC PF68 Ultra Cameo, mintage of 20000 pieces