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As mentioned its the rating is estimated for my stone we also discussed if there might be stones quarried in the past which might have been finer....

Actually the new quarried ones are not sold...

Also check this pierre aux Croissant:
http://straightrazorpalace.com/showpost.php?p=1501125

Iam not shure if this is a special stone, however its the first stone of this kind beeing stamped extra...

Dalmore or one of the Pierre aiguiser naturelle de Saurat, Pierre genre "Levant"....depending how fine it is lapped and when used with oil you can get some quite good results...

I do not like mine...