Great thread! Unfortunately, most of the marks are in need of translation, for me. I only know the meaning of two - the "turtle" mark, which my understanding denotes a northern Thai (Chaing Mai) origin, and the "bitter melon seed" (two rosettes), which indicates Aranyik. I have one that bears both:
I am somewhat tentative in the attribution, however, as I only have it from one source, who has been inaccurate in some other respects.
Here are a couple others I have seen:
I would be great if some of our Thai colleagues could verify any of this.