I have this hone that I bought here at SRP and in my opinion it is the best finisher I have owned. I don't think it is Thuringian and it's not a JNAP or a chinese hone, I own a few of each so I have compared .I am leaning towards maybe Frankonian, possibly. It's no big deal really, just curious. The hone is a dark blue color( almost black) and is very hard and probably more than 12k grit, it slurries a light color but it is slow to slurry. Here are some pics for whoever would like to see and help out, thanks for your time, Rudy.