thumbed A term used to describe a coin that has been doctored in a specific way to cover marks, hairlines, or other disturbances. Often associated with silver dollars, it actually is used on many issues, mainly business strikes.
Thumbed
Term for a coin that has been doctored in a specific way to hide marks, hairlines, or other disturbances. The thumb is rubbed lightly over the disturbances, and the oils in the skin help to disguise any problems.
Tissue toning ...
(The first type of the series was the first United States regular issue struck in debased silver -- 75% silver and 25% copper. The other two types were struck in the normal 90% silver and 10% copper alloy.) thumbed A term used to describe a coin ...
coins" (Red Book) (~$12.00) if bought and thumbed through will give a beginner a general overview. After common twentieth century types are acquired the collector can obtain more detailed texts such as Walter Breen's "Complete encyclopedia of U.S.
 See also: Type Three gold dollar, Motto, Draped Bust, Alloy, Dollar
  
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