Does anybody have experience with Berea Grit Sandstone hones? I picked a vintage one up and in learning about it thought it was really neat to have a mid-west connection to a hone. There also are some stones from a different formation here in Michigan that were used as grindstones. While I was able to learn a lot of cool historical information, I was not able to get an idea of the stones actual grit rating. I am in the early learning stages of honing and would not know how to evaluate the stone by myself. Hoping somebody can provide some insight.