Sheldon Scale. Image: Adobe Stock / CoinWeek. By Charles Morgan and Hubert Walker for CoinWeek Notes ….. The Sheldon Scale (or Sheldon Grading Scale) is a 70-point numerical grading system for evaluating the condition of both circulating and non-circulating coins, ranging from Poor (P-1) to Mint State (MS-70) or Proof (PR/PF-70). It replaced the less […]