1994年5元。中国古代科技发明发现系列。五枚一组。编钟、蚕丝、船桅、龙骨车、彗星发现。CHINA. Quintet of 5 Yuan (5 Pieces), 1994. Inventions & Discoveries Series. All NGC PROOF-69 Ultra Cameo Certified.1) KM-627. Recording of Comets.2) KM-628. Tuned Bells.3) KM-629. Silken Fabric.4) KM-630. Chain Water Pumps.5) KM-631. Sailing Masts.