I think that's equivalent to VF-37? https://www.ngccoin.com/specialty-services/ngcx-10-point-grading-scale/
7 would be xf40..7.5 xf45 etc... so it's "10" for a 70 only, 9-9.9 for ms, 8-8.8 for AU etc etc etc so they built this wonderful "decimal" system with 100 possible grades for a coin... then instantly threw out all the "extra" usable grades it created and stuck to the old format (ie all au's are 8-50, 8.3-53, 8.5-55 and 8.8-58 same values as the present grading system) To be honest, at this point I think the new system/NGCX is a dead horse
