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Message:: [QUOTE="Clawcoins, post: 3474966, member: 77814"]The odd part, if you look at the pictures you'll see one of their "rockwell test" in a design element.  So did the test mark RAISE with the striking and wasn't moved or distorted much.  how to do you take into account the striking pressure which supposedly raised everything around the testmark, including the test mark, but didn't erase the mark itself ? [ATTACH=full]924392[/ATTACH] The test itself does not increase the metal strength in that area to a point that striking would not do anything to it. Think of the pressure to move the metal into devices, etc.  And this pressure bypassed the test mark?  Also think of all the metal flow marks you get on coin fields.  This gives you an idea of metal flow and movement.  And yet, somehow a test mark would not be affected? If you look at the above picture, the lower part of the crater has the raised section pushed down by looks of the metal itself.  So this mark occurred after striking IMHO and allowed the device to shift up. Fred also mentioned in another thread that those pages are incorrect. I forgot to mention the rockwell test in normal industry can have various bearing sizes for testing, with 1/16th being the smallest for their machines, at least from what I have read.[/QUOTE]