Another real prototype, which went on to become the normal figure.
Here's what Jakks Pacific's modern 5 inch Eggman figure looks like before it is painted. You can see the various colors of plastic he is cast from. They will generally use the main color of whatever separate body part to cast the plastic so there will be the least amount of paint-apps required to finish it off. (Thus making it sturdier too) Curiously then, his head is done in white, because almost none of the head is white on the finished product.
This unpainted look also helps highlight the textured-on details, which is nice. It is always interesting to see a proto figure like this.