I'm looking for some help in identifying this hone. It was with some common sharpening stones left by my grandfather, who happened to be a machinist. The stones include several oil stones and Arkansas stones with profiles unique to sharpening tooling edges. I'm not sure what he did with this stone though.
The stone consists of layers with a blue/gray tint. I lapped the top with a DMT D8C and now to the touch its smoother than the Norton 8k. Although the lapped surface is dull in appearance, when wet its as smooth feeling as glass.
http://i625.photobucket.com/albums/t...psb5a7b0d7.jpg
http://i625.photobucket.com/albums/t...ps3f37d85f.jpg
http://i625.photobucket.com/albums/t...pseda40f97.jpg