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I am always very hesitant to put a grit rating on any natural stone, and there are different rating systems...
Check out Turkish Oil stones in the Hone Forum, see if they are the same..

Welcome to SRP

Here is some info on the Razor, it has been some time ago but IIRC they are very good shavers...

http://straightrazorpalace.com/razors/30040-little-help-please.html


Also...