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Yea. Could be Washita, just lap the flat side, leave the concave side.

If it Washita you need some loose 60 grit Silicone Carbide, you will ruin a Diamond plate and sandpaper won’t do much.

What are you lapping with?

You can get a 140-diamond lapping plate from Chef Knives to Go for $30. It is a great diamond plate that can take a beating. Great for lapping stones flat, then smooth...

“Don't know, don't care lol Just a soft, medium grit, brown stone that's dished to hell and back. It'll end up in the shop for rough, imprecise sharpening tasks”

I’m thinking, possible Jnat?
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Nice collection, soaking in Simple Green or Awesome will get the naturals clean without damaging them. I would not soak the synthetics, especially the Norton.

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