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All the information is very confusing and sometimes contradictory. What you need is a supplier you trust to find the hone you need.

I got mine from So Yama****a who used to be one of the very few...

Good thing about natural hones: they keep their value. Synthetic hones are second hand from the moment you lay hands on them.

I got a very nice Nakayama from So (150 Aus$) + shipping.

Not all the Nakayamas on his site are suitable for final polishing straights. But if you tell him what you need he'll sort you out.