It says on the little box it came in
Font of box: Rasiermesserstein Celtes
Kunststein-FabrikC. Pickel Marburg, Austria
inside of box stuff in english and german (i assume)
It is greenish gray a rectangle and 2" or so by 5" or so. Looks like it is in good shape.
Can anyone tell me anything about it? What is it worth? About what grit is it?
Thanks