U.S. Proof and Mint Sets
The United States Mint <https://www.usmint.gov> produces these collector sets annually. There are important differences between the sets. Proof vs. uncirculated coins Proof coins are a type of strike, not a grade. Both blanks and dies are polished, they are hand fed for minting and struck at least twice. Mint coins are Uncirculated examples of each coin minted, or produced, that year. They are also referred to as a Business Strike. Proof Sets: Proof sets are the longest-run
