Indian Hammer Tomahawk

Maybe a rare indian tool. This "hammer" weighs about 1 3/4 lbs. The "stone" is 3 1/2" x 3" and is 2 1/4" thick. Total length is 18". Looks like "catgut" holding it together.
The split in the handle may have had temporary repair bands as the pictures show dark bands at crack.
The same at the intentional “split” to allow the stone to be installed