Rare "NAZI" membership badge!

[Seppl]

This is the membership badge of the Ethnic German Organization in the Independent State of Croatia 1941-1945.It belonged to my late Grandmother.It's 22mm High & 12mm wide, it's enameled and pin back like a normal NSDAP membership badge, without maker's mark.It was manufactured by Giesler&Knaus,Zagreb.
Servus,
Josef

[Bernhard Getzl]

I have also this badge in my collection with the membership book for my grandmother who came from Agram (Zagreb) she was Volksdeutsche.I know it is a rare badge!
Servus aus KuK. Stadt Wien,
Bernd