Interesting that he started from the bottom and worked up. It would have been a similar system but with different numbers, if instead of starting with Poor = 1, he'd started with Mint State = 100 (for the finest FDC example - an 'ordinary' Unc coin might have merited 90) and then so on down, reaching Poor = 2 for example, or 1.5 even. Which I believe is what the LCGS system instituted over here, at least for a while?