The top of the paperweight does look like an Aureliano Toso piece, particularly the vaseline-like color that is in a couple of the large canes. I haven't seen a A Toso scramble bottom like this. It is very AVeM or Fratelli Toso-like. Is the weight low-dome? I suspect it is Aureliano Toso. I don't know if Martens had anything to do with the weights except being the artistic director of the company. Martens is often credited with designing the latticino-cane scramble work of AVeM and Fratelli Toso. I really haven't found any evidence for this. Judith Miller said "maybe" in one of her books. It was repeated by a couple of people, then finally evolved into a "fact."
I enjoy finding A Toso paperweights because they are not as common as other companies. The workmanship is often a bit sloppy, but it is just part of their charm.