What do the suffixes “C”, “H”, and “Y” in the models SBG[•] tell you about the type of GS movements being used?

The suffixes “A” to “Z” are given for different GS watch functions in a timepiece. The “B” in SBG[•] indicates the previous generation of SDs and HBs. The “L” in SLG[•] indicates that these are watches with the new 9RAx, 9SAx or 9STx next generation movements released after 2020.