[New, Unused] Natural Whetstone - Honzan Aogami - Kyoto Origin (Box Included)

Thank you for looking.
This is a listing for a new, unused natural whetstone, a Honzan Aizuri from Kyoto, with its box.
It was stored at home, but as I have no plans to use it, I am listing it for sale.

[New, Unused]
Kyoto Aizuri whetstones are recognized for their highest quality.
Suppliers may use different names such as Pure Honzan Aizuri, Seihonzan Aizuri, or  純正本山合砥石 (Genuine Honzan Aizuri Stone).
This is a product that those in the know will appreciate.
It is very difficult to obtain these days, so please consider it soon.

The size of this item is as shown in the photos.
Measurements were taken at the longest and thickest points.

This item has been stored at home for a long time.
The box is deteriorated, but the whetstone itself is a new, unused item.
Please refrain from purchasing if you are sensitive about such matters.
Thank you for your consideration.