Cleaning out my Grandfathers house I found this hone. I'm thinking it was used when he straight razor shaved. Th other pic is with Grandpa's old shaving mirror. Stone measures 10"x2". 3/4" thick. Stone is very smooth. Small stone is more course measuring 1"x1" 1/2" thick. I did flip it over and started to lap. Needs a little more more. Anyone know what type of stone this is?

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