Vintage Large (10 1/2" x 2 3/16") Natural Sharpening Stone

Really not sure as to what stone this is, brown/purple (ish) mainly with a few green spots, bit of a mystery stone. 

Some scratches etc on top and isn't flat as it is slightly dipped (dished) that bein said it is a nice looking stone that with some work will be a good stone.

Boxed, no attempt has been made to get this out of the box

Total weight with lid 1.420kg