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I have done some experiments with mine
I've used it after setting the bevel with a diamond hone using slurry in place of a 1-2k stone, it worked well this way. I've also tried mine with water,...

If I raise a slurry with a DMT, mine cuts REALLY fast and the slurry turns black, with just water it will start to discolor after about 40 laps, with oil its feels like a Coticule with water and...

Thanks Neil for the info and pictures!
The pattern and patches on the honing surface looks a lot like mine. What is the aprox grit on these, other people have said and I think I agree, it's about...

Dry it feels smooth and slightly chalky, wet very smooth and sort of like a Coticule with light slurry. There are definite orange splotches and it looks sort of gray when wet.

I picked this up a few years ago a still don't have positive ID
Due to the banding on the side, maybe Hindostan?
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