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I will take some photos of it. I haven't lapped it so it might be because of it, but I don't think so. As for the Wallachian sandstone, it's an excellent sandstone, at least the samples you gave us....

I got it on our meeting at Ardennes, it's a piece 20x2.5x0.5cm, I gave Radek a couple of stones and he gave it to me.

The WOA and TOS stones did not come from the same quarry like coticule/BBW. This stone is a natural combo and doesn't look like a WOA either, so we can safely assume it's not.
It could be the JaKa...