This is Belgian Coticule stone, yellow to white colour..
Grit size will be somewhere between 6000 and 8000 grit.
The cutting side is around 9mm thick.
Base slate is around 4mm thick
Stone is 5 ¾ inches in length. ( 145mm)
Stone is 1 ¾ inches wide. (44mm)
Comes in a wonderful craftsman made mahogany box.
Has a newish small chip in one corner.
Has a very old flaw, which shows up as black spidery marks.
Please email for Post and Packing, my charges are not excessive.