i recently purchased a razor hone for a local antique store, didnt know what it was untill i looked it up on the site, and much to my surprise, it and escher. the label on the one side reads" the celebrated water razor hone" in bold letters, unfortunately, where the cup would be in the center, that area is torn out, like it got caught on something. but here is my question, the actual working surface, looks like it has a glaze on it, is there a specific way to lap it. thanks for the information. im such a noob.