I guess I should say a little more on why I think yours is made by the Akro Agate Company.
The pattern. There were three or four main marble companies in the United States making machine made marbles starting in late 19teens, early 20’s. Akro was the first and actually the only company to perfect the “corkscrew” pattern, others tried, but Akro had the patent on it, and it could not be duplicated, that could be figured out back then anyway. The corkscrew pattern is literally what it sounds like, consisting of one or more spirals of color encircling the marble from one pole to the other without ever crossing. Some corkscrews have a double or triple twist, particularly those in transparent glass. Corkscrews have a white, colored, or transparent base.
Here are two photos of Akro Agate marble showing the corkscrew pattern, if you look at only the pattern, not the colors, you can see the similarities. I tried to find a photo of one that was similar to yours in color, but this one has a translucent bubbly base, while yours is more opaque, but they are close. // Okay, found an Akro that is very close to the colors of your marble (1st photo)
By the way, I bet if you hold your marble under a black light, the lighter off white/tan color glows bright green , that would be a good way to find out J