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 PF68 Ultra Cameo, PF67 Cameo, PF68 Cameo and PF67 Cameo respectively, #3944505-027, #3944505-055, #3944505-007 and #3944505-070. (4).
Estimate: $2,500.00 - $5,000.00