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Picked up another JNat and what was labeled a Kuro nagura (think it's a Tsushima nagura, correct me if I'm wrong). The JNat is an Ozuku (kiita with nashiji and goma?). It's harder than my last JNat...

So I was given a Jnat for Christmas! I'm not exactly sure what I have here, I think the stamp is "Jyunshouhonyama". The best translation I can get of the stamp is "genuine original mountain" or...