Old stock stone from the Tomae strata of the Ohira mine. Easy smooth working stone that makes a brightish kasmumi finsih with more water and pressure and with less pressure and on drying used mud it grades up to 3.5 to possibly 4 sub mirror. A great versatile stone.
This stone has a fissure on the upper left corner and is at a bit of a slant, it could use flattening and leveling on the bottom.
Type 40 refers to the size of the stone by the measurement of how many stones could be carried at once.
A ‘Nishi-Mono’ or Western mine that produces some of the highest quality whetstones. This mine is most popular for producing Uchigumori, which is a famous stone type used for sword polishing. For knife users however, we love Ohira Uchigumori to produce a dark jigane and frosty hagane. Ohira mine also produces highly sought after Suita and Tomae stones of various hardness, typically having a fast cutting speed and a toothy yet refined edge.
This stone has not been lacquered on the sides which is recommended to avoid splitting along bedding planes. Do not soak. We do our best to disclose any cracks or flaws but being a naturally occurring stone we cannot guarantee against these. That said these have been selected by an experienced stone dealer in Kyoto with decades of experience.