Help gepruft unknown

[Cpt.Lucas]

Hello, under leather belt interior the my visor cap officer infantry wehrmacht is present this gepruft IV.B/KS.P . What is the meaning?

Sorry for my bad english

Thanks

[CWP]

I'm not sure what IV.B would mean but I would speculate that KS.P would indicate Kriegsschule Potsdam. I have an infantry officer visor that has a school marking inside as well, mine is for an Unteroffizier Vorschule. I also have a K98 ammunition pouch marked for Kriegsschule Dresden. I do not think it is unusual to find items with school stampings.