It is used by nearly all major coin grading companies, the main two being NGC and PCGS.
Richter magnitude scale | Guinea (British coin) | coin | Sheldon Silver | Sheldon Cooper | scale | Moment magnitude scale | Fujita scale | Sheldon Leonard | Sheldon | Scale model | mint (coin) | Jack Sheldon | Edward Sheldon | Coin flipping | scale model | Scale insect | Rostral scale | Mint (coin) | COIN | Sidney Sheldon | Sheldon Vanauken | Sheldon Patinkin | Sheldon, Iowa | Sheldon H. Harris | Sheldon Harnick | Scoville scale | Mercalli intensity scale | International Scale of River Difficulty | Dollar coin (United States) |