This is a replacement button for an antique Philco radio. It's modeled from a 1940 model 40-180, but it's probable that it could fit other models as well. I'll have to do some research to be sure.
The original buttons were not made to last the ages. I am not exactly sure what material they made from, but from what I have read they were translucent/transparent "wine" colored. If you are going for accuracy, your best bet may be to print this in the transparent acrylic material and then dye it yourself. I left the material options open; however, should you care to customize your final restoration project (bronze might not look too shabby either,,)