This is the final price. I purchased this from a metal hardware store in Sanjo, Niigata, over a decade ago for ¥25,000. I bought it because I admired natural whetstones, but for me, artificial whetstones are sufficient, so it's a waste... (I can't even judge the quality of natural whetstones.) It has been coated with cashew lacquer to prevent cracking. Thank you for your consideration.