Jin 190mm High Speed Steel Ko-Yanagiba with Saya P-02 En I have been using this

I have been using this as a finishing stone for many knives now days

The handles are a bit smaller

and detrimental to some flattening devices

The three types of nails are Makigashira Kugi (the one with the rolled top)

Its a medium hardness stone that can work up mud pretty easily

Jin 190mm High Speed Steel Ko-Yanagiba with Saya P-02 En I have been using thisProduct Description Detailed Specs Measurements This high speed knife is one of a kind knife. The maker of the Jin knives was born in Tokyo before World War II and began making knives early on in his life. We met with him some years ago, during our first business trip to Japan. After a very nice meeting with him, we were lucky enough to be allowed to carry his knives. At the time we met him, he was already retired, so his knives are all new old stock