Quote Originally Posted by thebigspendur View Post
I'm told the more recent Coticules are inferior to the older ones and even those came in grades so it depends whether you have an OK one or a good one or a very good one or an excellent one.

The one I have is probably about 15 years old and when I got it that Coticule was my best stone and I used it as a finisher and I got great edges from it. Of course when I got my Escher the edges were better but the Coticule was darn good for shaving.
Given that they are all in excess of 70 million years old - or 700 hundred million depending on which book you read, the fact that you can discern a difference in 15 years is incredible.