Proof coins are struck with special dies and planchets. They usually look very shiny. Here is a side by side of a business strike cent and a proof cent: Impaired means it was put in circulation an now has circulation scratches on them. I like searching through these as they show doubled dies better. The coins only strike 3000 coins. (6000 strikes on some denominations) They just look sweet to me until they started adding the frosting to them in the 70's. So I buy the 1960-1964 examples of cents and nickels in rolls.
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