The main UK
TPG released a "cross-walk" of the sorts for going from UK system to Sheldon system earlier this year. It also shows the CGS 100 point scale approximate equivalents. But, just one note, the table stops at a Sheldon grade of 30, and that should be VF30, not F30. It's not perfect, but I don't know of anything that is.
http://www.coingradingservices.co.u..._cgs_grading
