It's a rare 2001P quarter that DOESN'T have those marks. Stretch marks in the plating while being struck - first year for high-speed, regular production minting of plated quarter planchets, and certainly heat could be the catalyst. (from Charlton catalogue; plating "process was acid based and electroplates a thin coating of nickel, then copper, then nickel again onto a steel core".) Obviously wasn't perfected until 2002.
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