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They are typically made with White #2, Some with Blue #2, and some vintage ones are made with Tamahagane. Iwasaki used modified Swedish carbon steel.
All those are good steels. I have honed a...

I have highlighted the problem area.
Inside the ellipse is what has remained from the hollow grind of the Omote side. That hollow grind should be present along the whole blade and it should bu much...

The first two, I think, have a lot of hone wear and the pics are taken so that it does not show much.
The third one does not show the Omote side all the way, may be ask the seller for more pics?

You need to look for as little hone wear as possible.