1993年50元5盎司，古代发明与发现系列。太极图。 直径 69 毫米。发行量 803 枚。颇珍罕而有趣的版别。与完美品相只有一綫之差。图文霜化浓郁，底板镜面锃亮，浮雕凸出，无起雾或斑点。
CHINA. Silver 50 Yuan (5 Ounce), 1993. Inventions & Discoveries Series: Yin & Yang Philosophy. NGC PROOF-69 Ultra Cameo. KM-507. Diameter: 69mm. Mintage: 803. A fairly <strong>SCARCE </strong>and interesting type, this enticing specimen verges upon perfection and presents highly frosted devices paired with exceptionally mirrored fields, ultimately forming a great cameo allure with no haziness or spotting.
