Morgan Dollar Carson City 1882 CC GSA Hoard (Sealed) coin. Comes with its special envelope issued by the U.S. Mint, a certificate of authenticity, and a unique number for each coin. Considered one of the most important and rarest American coins. Specifications: Composition: 90% silver Diameter: 38.1 mm Weight: 26.73 grams Mint: Carson City Mint mark: CC Mintage: Only (605,029) pieces