If I ever owned that stone and sold it, it would have had to have been a lot of years ago.
Possibly...but I don't remember it.
There are a lot of great really high grit stones out there.
Naniwa 10k Superstone if my favorite. Others like the Kitayama....it's not as coarse as the 8k label indicates in most peoples opinions.
There are others as well, but the SS is my fav.