China
People's Republic Four-Piece "Lake Placid Winter Olympics" Proof Piefort 30 Yuan Set 1980, 1) Speed Skating - PR69 Ultra Cameo NGC, KM-P152) Alpine Skiing - PR68 Ultra Cameo NGC, KM-P163) Biathlon - PR68 Ultra Cameo NGC, KM-P174) Figure Skating - PR68 Cameo NGC, KM-P18A popular set with a listed mintage 2,000 in the Standard Catalog of World Coins, but an actual mintage of only 500 each. All are essentially white, with the figure skating piece showing a touch of golden color on the reverse.
Estimate: 4000-5000 USD