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Thank you Botanic. A wealth of information in those links.

After some searching I have found some similar stones with those inclusions on a Russian website. Apparently a type of Llyn Idwall called "Cambrian Green' or Cutlers Green" (if that website is...

I thought so to, but the inclusions on the side of the hone threw me. It is so similar besides that though.

Hard to believe nobody knows anything about this stone.

It's fairly aggressive with a slurry and picks up lots of speed, almost a gritty feel with a noticeable drag, the feedback on slurry...

The color is off in the photo's, it's a dark green.

As found....
https://live.staticflickr.com/65535/50825024288_957b21a398_c.jpg

Lapping...
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