I will have to do the test again. The results I'm getting are defying the laws of physics, hence the screen shots, 95%+/- is the figure everybody quoting so assume this anvil is the same. But at the end of the day it's irrelevant all you have to do is work on it and you can feel the difference. At the moment I haven't got my shop set up, I just put the anvil, vice and stump in and sat my old gas fire on top of the coal forge. I need to make a flue for the coal fire, it's good enough for now to work machine made shoes and shoe a few horses that I have come to me. I hope to have it all finished by the end of the year as next year I plane to work mainly from home shoeing and up skill in general blacksmithing . I have just picked up a 9 ton screw fly press which I have been fixing up. I have no experience with using one, I'm looking foreword to playing with it.