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Thank you for the info. Now that I have the naniwa 10k (1k, 5k, 8k, 10k, CrOx strop) do you think I will notice the difference with the 12k? (Please give me an excuse to buy it, I'm addicted :-) )

Got a reply from Naniwa:

"As you asked, ours #12K of Super stone does not list in our web site officially.
This grit 12K developed for overseas market, and maybe 5 years later produced to market....

Yes I asked them. Waiting for their reply.
Will update you here.

Any idea why Naniwa don't have the 12K super stone in their site nor in their catalog?
I wanted to buy the stone directly from Japan but the highest grit available super stone (from several...