1980年1元精制加厚板。奥运系列,四枚。1) 高山滑雪。NGC PROOF-69 Cameo。 2) 速滑。NGC PROOF-69 Cameo。 3) 花样滑冰。NGC PROOF-62 Cameo。 4) 冬季两项。NGC PROOF-68 Cameo。CHINA. Brass Yuan Pieforts Proof Set (4 Pieces), 1980. Olympic Series. All NGC Certified.1) Alpine Skiing. NGC PROOF-69 Cameo. KM-P7.2) Speed Skating. NGC PROOF-69 Cameo. KM-P8.3) Figure Skating. NGC PROOF-62 Cameo. KM-P9.4) Biathlon. NGC PROOF-68 Cameo. KM-P10.