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Yeah, I immediately forgot about that! See my edited remark above. The slurry does look similar. You're not that far from Italy, no?

Check out the link I gave in my first post. I've used it and a smaller one on a paddle, and it's not that coarse. The surface smooths over quickly; slightly finer than a Saurat Pyrenees "lisse"...

There was some kind of "Italian Frankonian" on ebay once. Looked interesting, but the price was beyond my means at the time. Attached are some of the seller's photos. On the lower end, there is...