Vintage Belgian coticule sharpening stone

The stone measures 185 x 42mm and is a glued combination stone. The stone appears to be glued with hide glue so I assume it a quite old example.

The stone has been lapped flat down to 400 grit diamond plate level ready for use.

There is a small chip out of both ends of the stone, this is clearly visible in the photos

Any questions feel free to ask