Until 5/31 [Reason for Discount] Amakusa Whetstone? Round Whetstone 20cm 4.6kg Unused With Crack

This is a round natural whetstone.

When I received it, I was told it was Amakusa whetstone, but I cannot confirm this, so the details are unknown.
Please judge from the photos.

It has a hole in the center, and its shape suggests it may have been a grinding wheel used with machinery, but its purpose and details are unknown.

[Size]
Diameter: Approx. 20cm
Thickness: Just under 7cm
Weight: Approx. 4.6kg

*Please allow for slight errors.
*Please also check the ruler in the photo.

[Condition]
Unused, long-term storage item.

There are stains, discoloration, chips, and small scratches due to long-term storage.

Also, there is a crack as shown in the photo.
Please understand that the condition may change during shipping.

For shipping, it will be wrapped in bubble wrap and packed with cushioning material (paper) around it.

We ask that only those who understand this as a reasoned item (訳あり品 - item with defects) purchase it.

*Please check the condition in the photos.
*Please refrain from price negotiations.

*Will be removed on 5/31.