This is a whetstone that requires some skill to master.
A key tip is to thoroughly work up a slurry and apply firm pressure while sharpening.
Dimensions: 88 x 133 x 10 mm
Weight: 310 g
Quarry location: Kyoto Prefecture
* Image 9 shows the stone after water has been applied.
* Image 10 shows the amount of slurry produced after 20 strokes.
* Image 11 shows the finish achieved without pre-generating a slurry.