Can anyone shed some light on these scales with a certainty?

What, for example is a BUC coin on the sheldon scale and on the british scale? and same goes for other grades?.
I have tried to make a Table to compare these, BUT......input needed to confirm or correct!


I most likely have some of them incorrect...
USA & Canada sheldon scale SPINK GRADING UK
G-6 Good Poor
G-8 Good + Fair
F 12 Fine F-
F-15 Choice Fine or F+
VF 20 Very Fine VF
VF 30 Choice Very fine or VF +
EF-40 Extremely Fine XF
XF-45 Choice Extremely Fine or GVF (good VF)
AU-50 About Uncirculated AEF(about EF)
AU-55 Choice About Uncirculated EF
AU-58 Choice+ About Uncirculated Near UNC
MS-60 Uncirculated Uncirculated UNC
MS-61 Uncirculated
MS 62 Near choice Uncirculated
MS-63 Choice Uncirculated Brilliant Uncirculated BU
MS 64 Near Gem uncirculated
MS-65 Gem uncirculated Fleur de Coin FDC
MS-66 Choice Gem uncirculated**
MS-67 Superb Gem Uncirculated**
MS-68 Near perfect Gem UNC**
** MS-68 bis MS 70 are extremely in demand and very rare
I hope this is of interest to a lot of you...
have a great day... awaiting your answers and input
HHB