US Mint 1988 Olympic Coins Proof Set Silver Dollar And Five Dollar COA. Pristine condition boxes and documentation. The item "US Mint 1988 Olympic Coins Proof Set Silver Dollar And Five Dollar Gold Coin COA" is in sale since Friday, April 9, 2021.This item is in the category "Coins & Paper Money\Coins\ US\Commemorative\Modern Silver/Clad (1982-Now)". The seller is "amessilversmithing" and is located in Ames, Iowa. This item can be shipped to United States.