Thread: hone help please.

I picked this little hone up at a flea market for $3 I didn't think much about it, and mainly got it for the wood box. but after lapping it, I am amazed at how smooth and fine grit it is. it feels like silky glass on that lighter colored surface. I have to say by touch alone, this would have to be the finest grit stone I have now. I assume this is a manufactured stone, by how it laps. the slurry gets very thick and gummy almost like glue, but that could just be the old oil soaked into it.

my question, it has had oil used on it in the past, should I deep clean it so I can use water in the future? or is it suppose to use oil?
also, anyone know anything about it? I have seen similar stones in the past but they always have a label on the side.