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+1 John. In some ways we do have better information on JNats, many sellers describe individual stones unlike what I usually see with cotis and Thuris, and you can usually tell when a seller thinks...

It appears to have the same stamp as Ozukus sold by Max and Mark:

Ozuku Asagi lv 5 + (a547) - Japanese Natural Stones

Ozuku Japanese Natural Stone

Fendrihan sold some too, maybe check their...