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This is what I do, most stones have printing on the side, I look at it as the "top" side is for razors, and bottom for knives.
But I am a complete stamp whore, so if my stones have huge stamps on...

I would look for a vintage stone on an auction site or such. Search for 'Washita Stone" or "Arkansas stone" should be able to find something in that price range that is history proven for knives. ...