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This was loaned out to someone with extensive experience with these sorts of things and it was determined to be what is typically referred to as a Vosges / Vosgian/Vosgienne stone. Here is HHT using this stone as a finisher after a vintage coticule post a slightly modified dilucot to account for the speed of my coti. It provides no feedback when honing, you must watch how the edge interacts with whatever fluid you are using, but the edges are tremendous.
https://www.youtube.com/watch?featur...&v=oTAVhp6jvYM