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roll friction Minor displacement of metal, mainly on the high points, seen on coins stored in rolls.
coin friction Term applied to the area resulting when coins rub together in rolls or bags and small amounts of metal are displaced. See also roll friction.
coin show A bourse composed of coin dealers displaying their wares for sale and trade.
five dollar and twenty dollar coins have been rolled 20, 40, and 50 to a roll -- other variations are certainly possible. Gold dollars, quarter eagles, three-dollar coins, and eagles have also be seen in rolls of varying quantities.) roll friction ...
 See also: Surfaces, Reeding, Nickel, Strip, Struck
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