That sounds really interesting.Very nice Made in Japan finishing stone, the grit is listed as No.4, but feels like in between medium and fine stone. Cheap stainless becomes aggressively sharp after getting a microbevel with this baby. I use soap water as
lubricant instead of oil.
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I got these from my mechanic father who worked for Suzuki company, probably made during 1980's, don't think they are available anymore. Aluminum Oxide, probably the same material as those from Spyderco. I only got 3 pieces, highly valuable to me!That sounds really interesting.
Can you find this stone in an online shop that also ships to Germany / Europe? Do you have a link?