People's Bank of China, group of 4x brass proof 1 yuan, 1980, issued for the Winter Olympics, Speed Skating, Figure Skating Alpine Skiing and Equestrian,NGC PF66 Cameo, PF66 Cameo, PF65 Cameo and PF67 Cameo respectively, #3944505-031, #3944505-058, 3944505-017 and 3944505-110. (4).
Estimate: $2,000.00 - $4,000.00