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Thuri would probably be my second guess, but if the stone is old, did they even sell Thuri bouts in the ‘olden days’?

I think we’re at an end without the stone in hand, but maybe there’s another...

There are several Japanese ‘indicators’.

- the ‘cloudy’ surface appearance
- the irregular layer cracks (look like irregular white lines)
- the natural ‘skin’ that’s iron-bearing
- maybe the...