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Celebrated water razor hones are old stones, I don't think there is someone who sells NOS pieces, but you'll find many on ebay, and every now and then, here on the classifieds. Try not to spend more...

The first photo looks like a coarse stone, but the lines on the sides makes me think it's a natural. If you would like more information about the stone, we need a lot of photos. I don't think it's a...