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Actually I will save the slurry and after it dries I'll add oil to make polish for the dremel.

I was gonna check a corner or pop it out of the box first to see what it was.
If it is junk I will resell it as "vintage sharpening stone hone etc".

If it is coticule then I will saw the extra...

Thoughts?

I just couldn't stop looking at the brown underneath.
The age is good (old as hell)
Based on all the dried slurry I would say it is soft-ish.
Plus it is really dished, which should be...