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Here's the koppa in question as unpacked with a Mejiro and Hanoyama nagura stone.
Tried the rock set last night on a TI Le Dandy that I have and found it a nice work area for it's odd shape....

Ahh, thank you sir. Makes sense as it is an odd shaped stone.

Hi gents. Have a Japanese natural coming and was wondering. What does the term koppa mean? The seller refered to this stone as a Koppa. I presumed it is about the size of the stone but wanted to ask....