I am ashamed to say that I am not sure if the type s.S. ball was originally intended primarily as a machinegun cartridge, or whether from the start it was for Rifles and MGs. Are you there Dutch or Phil, to help us out on this?
The “S” ball was not totally discontinued in Germany with the adoption of the type s.S. ball as standard. The last lot I know of for the Type S ball was from 1940 and made by Polte, Werk Magdeburg.
Yes, the Czehs, as well as Poland, Belgium on some contract ammo at least, and perhaps others (can’t think of them right now) used the German-style Type S and Type s.S. bullets, and used the German color codes of black and green, respectively, for them.