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Here is the plate on Amazon. See if you come up with the same. I accessed it doing a google search for 'Atoma 400 Diamond Plate'. Note the page that came up ;

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I see what you mean now,...

I got mine from Tools From Japan. Atoma diamond plates. : Tools from Japan, Japanese woodworking tools direct from Japan.

Do a google search and you'll maybe find other sources that might be...

I have the 1-3-5-10 in the Chosera line, and had the 1,3,5,8,12 in the superstones at one time. There is a PDF file, in this old post from 2010, of a comparison chart of Japanese grit ratings for...

In my early days honing diamond plates seemed like a great idea, but in practice it didn't work out that way for me. I'll only resort to a diamond plate under special circumstances, and use the ones...