Antique Carpenter's Tools (Natural Whetstone) Shrine Carpenter Craftsman Suita Masamotozan

This is a natural whetstone that was acquired from someone who previously ran a carpentry specialty store.
According to them, it is a product from about 30 to 40 years ago.
It is unused, but I believe one side of the back is chipped from the beginning, resulting in a difference in thickness and an uneven surface. Therefore, please use it with a stand to level it.
Please also understand that there may be some dirt and scuffs from age and storage.
Please note that there is no box.
I have tried my best to photograph it, but as it is amateur photography, please understand that there may be slight differences in color tone.
Please understand that this is an old item and refer to the images before making a purchase.

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