"Proof coins" are extra shiny coins made for collectors. They polish the blank, polish the die, and then stamp it more than once. Blank areas of the coin have a

"Proof coins" are extra shiny coins made for collectors. They polish the blank, polish the die, and then stamp it more than once. Blank areas of the coin have a practically mirror shine finish. Here's a side-by-side comparison: https://www.govmint.com/learn/post/how-is-a-proof-coin-different-from-a-regular-minted-coin https://www.govmint.com/learn/post/how-is-a-proof-coin-diffe...