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Sheldon coin grading scale
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Sheldon coin grading scale : ウィキペディア英語版
Sheldon coin grading scale

The Sheldon Coin Grading Scale is a 70-point coin grading scale used in the numismatic assessment of a coins quality. It is used by nearly all major coin grading companies, the main two being NGC and PCGS. The scale was invented by William Herbert Sheldon.
==Original Sheldon Scale (1949)==

In 1949 the original scale was first presented in "Dr. William H. Sheldon's Early American Cents" titled "A Quantitative Scale for condition" as a way to grade Large cents. The scale is known today as the Sheldon scale.

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