Search:

I even use them dry, they leave a sharp edge dry ime
Also on my razors I use them dry from time to time, then go to the Yellow Coticule, which smooths it out a bit
Bit it reaches maximum keenness /...

I have a small collection of "modern" and "vintage" BBWs and from the pictures I see, the stone looks almost identical to a couple of BBWs that I have (I use mine a lot, ergo why I'd say it's a BBW...

Looking at your pictures that looks definitely like a very nice Blue Belgian Whetstone (Lorraine is a type of BBW)

It will leave a very sharp nice edge, for sure