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Oldengaerde & Pauly & Brighty, you can see that the stampings on stones can be misleading in most cases. Below are two copied sheets from a book distributed to members of the Kyoto Miners Union.
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And Mainaman I agree. These paper labels are from the wholesalers/consolidators down on the flatlands who distribute the stones to retailers. The wholesalers have drawers and drawers of paper labels...

Excellent call Oldengaerde, Naurtaki it is. The Narutaki was one of the original mines close in to Kyoto and they did produce some excellent stones. Softer is not bad if the cutting action is fast...