Thank you very much for looking. I personally assume it might be a brand of a firm which formed the front plate of this buckle. But the hard I ask and look I cannot find any firm (as large as to have a Werkschutz) with such a brand.
To me it looks like a star ("north-star"???)or a cross with a sword to the lower left. But I am not sure about that.
Any further help will be appreciated.
Regards,

wotan, gd.c-b#105

"Never look for sqare eggs" as a late owner of an original FHH-dagger used to say.