help identifying oil stone

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Nov 8, 2018
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Msorto89
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any ideas on what it may be. What I can make out is Fast cutting, Made for sharpening of m, and keep stone. tnx in advance
 
I cleaned it up. but wasn't to dirty. If it is a india then it must be a fine. I have a few nortons med and this is much finer.
 
I have mostly combination India stones, coarse & fine. But I have one India that is much finer. Something like 600 grit. It is just one grit. DM
 
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