data incorrect
swastika feature predates seance queen blatavsky, eg, of course, 19th Century deco at HH ex-monastry dorm-school in Austria.
pre-unif german princes were touring around foreign haunts spending inheritances same same french and italian and spanish alphas. Universities were naturally super-spreaders of foreign/exotic secrecy and symbolism. There was no TV, and ballet and opera etc at the typical royal schloss drove the cool younger set to raunchy beerhalls (of their era) for a good time. Most were into secret societies/cliches. I wasn't there, don't know for sure, but…