circle S rework mark

Art, I've also owned a couple of these reworks and I alway assumed from the conventional wisdom, that they were done by Simson, but I'm not sure either. Simson's commerical marking was a stylized S in a triangle in a circle. Close but not really the same. I suspose a case could be made for these being amoung the very few marketed by the Weimar era Circle S convience stores.