My Grandpa gave me this old razor hone.

old American hone co. strop back a leather strop attached to the back side. probally around 4 to 6k grit rating.
 
It's a stone for maintaining your straight razor.
Like kn4wd said, probably around 4K to 6K grit.
It's in very good shape as well. There is a collectors market for those just like anything else.
You might try searching straightrazorplace.com or badgerandblade.com, might find some more info there.
 
Despite the 4k-6k grit estimate, which is somewhat pointless, the hone does in fact produce a perfectly good shaving edge on a razor.
 
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