Slate razor hone order - possible thuringian water hone for razors - water razor hone, vintage straight razor honing stone

Here we have an amazing razor stone. I belive this is a Thuringian water hone order, but I as it has no label, box or typical size of thuringian hones, the price will be low .

The color of this stone is "Dark Blue"(almost black).
The dimensions of the stone:
- long 138 mm
- wide 36 mm
- thick 18 mm .
The stone was lapped and prepared for work with carbide cremnium powder - It is absolutly ready for Your razor.
Some pictures show water on the stone for clarity.

Please, feel free to ask any questions, I will always do my best to answer.