I imagine it would be extremely difficult if not impossible to tell from a picture, but it can't hurt to ask.
I picked this hone up for $20 at an antique store. All the guy had to say was that it was "really old". It seems to be very fine and extremely hard. I tried lapping it off and on for 2 days with wet/dry sandpaper and the progress was so painstaking I'm giving up for now until I can get a DMT.
The stone was a dark gray/blue but when I started lapping it it turned very light gray.
Any input is appreciated.



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I use the 325 to dress my other hones as it leaves a nice smooth feel up to the 8k hones. After that I use the 3k shapton GS to polish the finer hones.
It's driving me nuts.
