i couldnt tell any marble, was made by either of those two. not enough detail in the pics for my eyes. i dont know when those guys started making the marbles but brownie remembered washington courthouse, springfield antique show and a few other markets that he sold most of those guys work. brownie taught tom thornburg, the ENTIRE CERAMIC MARBLE ART FORM, i think tom does excellent work. brownie did inspire another ceramic artist, i think it was a woman named penny kelley. i do remember the guinea incident in springfield.
old man hamon was a glass artist and did make marbles. two of his nephews john hamon miller and boyd miller went on to make marbles. i worked with boyd often over the years. edna has more knowledge of the hamon glass/bloodline than i do