1998年20 元精制银币。 香港回归纪念。长方形。2盎司。香港会议展览中心。精制,霜面图文配以镜面底板,夺目诱人。CHINA. Silver 20 Yuan, 1998. Return of Hong Kong to China. NGC PROOF-68 Ultra Cameo.KM-1166. Rectangular 2 ounce coin featuring the Hong Kong Convention Center. A brilliant and attractive proof with hard mirrored fields and frosted cameo devices.