1980 China Olympic Coins Silver Proof Set w/ COA. The item "1980 China Olympic Coins Silver Proof Set with COA" is in sale since Wednesday, December 2, 2020. This item is in the category "Coins & Paper Money\Coins\ World\Asia\China\PRC (1949-Now)". The seller is "ken-817467" and is located in San Francisco, California. This item can be shipped to United States.