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As said from me, my own Le Veinette also has developed some cracks in the side, and I simply used CA glue in order to give myself a little piece of mind, it is worth remembering that as with all things natural, flaws and small cracks are bound to occur, when they are onkly superficial and do not impede the performance of things, I believe they add character :thumbup:
It's perfectly normal to find such lateral cracks in standard grade Coticules. They do no affect the performance at all, and it's nothing to worry about.
If it makes you feel better, you can drip CA-glue into the crack, till it's completely filled. You can rub in some dry Coticule dust, that you could sand of a slurry stone. Clean any spilled CA immediately after application, because when it cures you can only lap it off. This is only an optional treatment. If it were mine, I wouldn't do anything.
They don't apply exact rules to rate a Coticule select or standard. It's more a matter of when they feel a Coticule has a few cosmetic issues that might lead to a customer being less happy when he compares it to a "normal" one, they will rate it "standard". All the rest is "select".
But since they charged a premium for "Kosher" grade, I would definitely contact Ardennes with your concern about that crack. According to my information, Kosher means that an orthodox Jewish butcher would be willing to use the Coticule during his job. They want stones without any cracks because their stones gets covered with animal blood, while the are constantly touching up the keenness of their knife during the action. For that reason they want non-porous hones, free of any cracks. There is no further meaning of the term Kosher for the sake of sharpening razors. Personally I would prefer if they told that to customers that are not Jewish Butchers, but still demand a "Kosher" Coticule. If they charged you extra for it, then the stone should not have such a crack, in my opinion. Do note that my opinion is just that: my opinion. Ardennes may have a different viewpoint, but I would still contact them.