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Mystery stone - is it a coticule?
I bought the hone in the attached for a few dollars on ebay. When I bought it, I figured there is a chance it's a coticule, so I gambled. Now that it's here, I still don't know. It is a tan stone, bonded to a dark gray back, which might be slate. It's more brown than the one coticule I've seen in person, but it looks lighter when I scrape at the surface, as you can see on the side, about a third of the way from the right-hand end. It measures 6" x 1-1/4" x 5/8" and is very smooth (as in fine grit).
What do you gentlemen think? Could it be a grubby coticule? Is there any other hone which fits this description and photo?
Thanks for your help!