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Hi Petr unfortunately the answer is no.

Japanese Naturals are graded by the seller only.
So it is totally up to him, how much he thinks it is worth.
There is no recommended price area, there is...

I think you have to be way more precisely.
What do you want to do, what is it you expect?

J-Nats come in uncountable variations from proper to unusable,
from 30bucks to 30.000 USD.

The most...