I went yesterday for a couple of hours and found only 1 thing worth coming home with. I think it is a small grinder might be too small for a Mano. Let me know if is anything or just a rock. Thanks for looking.
Bottom and then top. The bottom has a in curved dimple on it.
I have one that twins that one. I always thought they were cones until your post with the cone. Grinder.. Makes perfect sense. Mine has lines going in one direction.