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The first picture is a BBW beside a piece of slate used to back a coticule. Distinct colour difference. The second picture is a picture of the slurry produced on a BBW. Hope this...

That is up for debate. My thoughts are a 100 year or less gap in when the stones were mined wouldn't make much of a difference in a rock that took millions of years to create in the first place. It's...

That indeed looks like a Belgian Coticule. The bottom half appears to be slate and used only to give the brittle Coticule some support not for actually honing. As for the top half lap it and off you...