1993年5安士50元银币。古代发明与发现系列。太极图。 CHINA. Silver 50 Yuan (5 Ounce), 1993. Inventions & Discoveries Series: Yin & Yang Philosophy. NGC PROOF-69 Ultra Cameo. 发行量803枚。深受喜爱的大规格,拍卖场上不常露面。霜化图文,镜面底板,浮雕生动迷人。 KM-507. Mintage: 803. A popular large format issue that is seldom offered in auction. With frosty devices and mirrored fields, this piece has a very enchanting cameo nature.