I'd call it a crockery marble. I have a number of them but I am not sure about their origin. I usually lean toward Germany, mostly because of that greenish brown color, but I sure wish I had more certainty because sometimes I lean towards one of the earlier American manufacturers like Standard Toy Marble or American Marble and Toy Co.
I do know that it's not what we typically call a Bennington and it is likely at least 100 years old.