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Its possible the holes are full of grit like maybe a nagura or tomo. Ive heard that some recommend not using nagura or tomos on suita for this reason. If it were mine, I would lap it down a bit and...

I would look at it with a loupe as they could be holes with swarf in them, or minerals splashed in the stone. Bottom line is how does it produce? Everything else including stamps is irrelevant.