American Numismatic Association

24 Aug 2022

Converting Sheldon Scale Grades to a One Hundred Point Grading Scale

Since my last blog, I spent a great deal of time pondering how to go about converting the Sheldon Scale (SS) to a 100 point scale that I now call the Metric Grading Scale (MGS). This was not easy to do due to the idiosyncratic ranges of grades for categories of coin grades.� Sheldon essentially has four basic grade categories;� Good, Fine (and all the kinds of fine a coin can be),� Almost Uncirculated and Mint State).��

12 Aug 2022

Third Party Graders, A.I. and the Need For a 100 Point Grading Scale

| I. R. Bama

I have been reflecting upon discussions here over the past two years about third party Graders and how there are differences between grading companies which translates into different grades being assigned to the same coin. We have discussed how even resubmitting the same coin� for reevaluation by the same tpg can result in a different grade.

I. R. Bama's Blog