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There are differences, in the Nortons when it comes to lapping them in. I would like to say that it coincides with where they are made, (USA, Italy, Mexico) but I can't say that for sure, it is just...

Besides the flatness issue/non-issue Naniwa's and Nortons have a top layer that just needs to be removed before they start honing their best.. I didn't notice this on my Shapton's but it has been...