China
People's Republic silver "Inventions and Discoveries" Series II Proof 50 Yuan (5oz) 1993 Gem Proof, KM507. Yin Yang/Fu Lu Shu. In the original case, and mint-sealed soft plastic, with COA #298. A superb, unflawed example, that is seldom offered. Mintage of only 1,000 pieces.
Estimate: 1500-2000 USD