When looking at the map with the different layers they place karasu in the aisa. I have seen Nakayama, Ohira, Takshima suitas from reputable vendors. From what I have read karasu can definitely show up in Tenjou suita. Not sure about the rest of the suita layers.It does look like suita, but I thought karasu only showed up in the aisa layer ?
I like the stamp that says its "for razors"This stone is slower than molasses in January, but it is absolutely amazing to hone on...the slurry breaks down for days and just keeps polishing. The tomo that came with it was nearly as long as my femur. I cut three pieces the size of my palm and I have a few stones left over. Nakayama Maruichi Kamisori; pure finisher. 135x83x35. One pic with stamps and one without.
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I have one a lot like the Iromono. I love it. Awesome stones. Show us your Japanese Natural Whetstones - https://www.badgerandblade.com/forum/threads/show-us-your-japanese-natural-whetstones.180558/post-11100194