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Howard's username is Howard, BTW. :) That wasn't readily apparent from JMS's post. His website is www.theperfectedge.com.

He knows a lot about these hones.

Josh

You guys are right. I forgot that they made artificial blue/yellow combos... The epoxy had me thinking it was a slate-backed hone, but now I'm not sure....

The backing does look lighter than the...

I think that's a yellow coticule bonded to slate. The slate won't hone anything, but the coticule is a great hone for finishing an edge. It's between 8K and 10K, usually. You're lucky; you got the...

That's quite a find--even more so if it's a combo stone. You saved yourself some serious $$$ and got a hone with some history.

Post a photo of the spot where the two sides join; that'll help us...