Blus OS cap, which organisation? pls help

[J. Csernus]

Hello genst,

I've recently got this blue OS cap, first I was thinking it's a Kriegsmarine cap, but the cut is not the same as I used to see, so I would think this one belonges to some political organisation, Reichsbahn or anything else? any infos are welcomd, thanks watching!

[J. Csernus]

2

[Erich B.]

Are there any signs that the cap once had insignia applied?
Erich

[germanpolice]

Early feuerwehr