Yes, I got it from JimR a few weeks ago. I didn't play with it too much because time is short, but Jim said it is a nice finisher, so I will learn to use it when I will have the time for it. First I have to make sure I use my new shapton pros to their maximum, so I will know the difference between the Jnat and the 12k :)
It is from a stainless steel a friend of mine uses for his cleavers. KO-13, about 0,5% carbon content, 56HRC with gas protecting HT (I don't know if this is the right english translation for it :) ).
I will have to test it extensively, but looks like good stuff after the first few tries. It is not CPM30V, but the old sheffields weren't also, so I hope it will shave nicely and will hold an edge for a few shaves. I am planning to get some other steels to use, but I wanted to keep it simple in the first time, this was the steel I could get easily nearby.
I used a hacksaw to cut the rough profile from a bigger piece, then bench grinder all the way to rough grinding. I used a 4" wheel with 180 greaseless to soften the lines, and then I sent it for the HT. After it I finished the grind on the bench grinder, and used 180-320 greaseless and a bit of polishing compound to get it looking nicely. Not too much equipment, but I will get more as I go along the way :)
Rough sharpening was done on a fresh sheet of 400 sandpaper, and then Chosera 1k, 4/8k Norton, and then my time was up, because I had to travel to a local straight meetup with it. Now the edge is not in the best shape from a lot of probing and a few bad touches, so I will put her on the 2-5-12k Shapton pro stones today, we will see how it goes.