CoinWorldTV1991, China. Proof Silver 10 Yuan “Christopher Columbus” Coin.Mint Year: 1991 References: KM-372.Denomination: Proof 10 Yuan - 540th Anniversary of the Death of Christopher Columbus. Material: Silver (.925)Diameter: 38mmWeight: 27gmChinese modern coinage dates from 1979 when the China Mint issued its first commemorative coins in their precious metal coin program that continues ...