Two of the six coins (Y#174 and Y#186) are uncatalogued as proofs with the Moscow mintmark.</br>These coins may have toning and come encased with the certificate of authenticity.</br>Complete six-coin sets are hard to come by after more than 30 years and rarely offered for sale!.</br></br>Product Description</br></br>Russian Gold coins commemorating the 1980 Olympics in Moscow! These six Gold Proofs each contain 1/2 oz of fine Gold. The total Gold weight of the set is 3 ounces.</br><br/>http://www.amazon.com/gp/product/B06Y1VPFJN