The hackenkreutz or broken cross (swastika) was a common motif in German occultist beliefs, specifically the Thule Gesellschaft (Thule Society).
I had always understood this to be so, as well, and that the hackenkreutz or broken cross (swastika) was composed of two crossed “Victory” (Sig) runes from Germanic Runic Tradition.
Funny that archaeological evidence of the swastika dates back to the Neolithic period, as well...