China (People's Republic), silver proof 50 yuan (5 oz) Panda, 1990, NGC PF 69 Ultra Cameo ("top pop"). KM-273; PAN-131A. None higher at PF 70 in the current NGC census. Mintage: 5,000 (planned; actual and surviving unknown). Pedigreed to the Gansu Collection of Chinese Panda Coinage.
Estimate: $500 - $750