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Hard to say from the pictures, I kind of have a confirmation bias on old stones. I want them all to be nice Eschers/Thuringians. I'd say the only real way to tell is to lap it and try it out. You'll know almost immediately if it's a thuri, I haven't had a stone yet that replicates the feedback I get from mine. Just my two cents, someone with more knowledge will come along and have more info I'm sure.
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Always complicated from the pictures to see if it's a Thuringian stone or not... I don't have enough eye for that :thinking:
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Could well be from the pictures. Typical scratches and cutting marks like a thuri!
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I am by no means an authority but it looks like a blue green Thuringian to me. Those saw marks on the edges is typical for Thuringian stones.
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Thanks gentlemen :chapeau