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<p>[QUOTE=&quot;desertgem, post: 2680548, member: 15199&quot;]The problem is that 26.73 is the nominal weight, but the tolerance is +/- 0.097 gram, so a fresh Morgan could have been anywhere in a range of&nbsp; 26.83 (significant ) to 26.63 grams. To say how much weight loss occurs with different degree of wear, you have to know the weight of each sample when minted , and then using the graded weight , determine the percentage of loss. I set up an experiment a year ago with 5 mint 1959 Lincolns, all had varying initial weight measured on a lab scale, but it became static as I could not decide on a mechanism to produce identical wear to a grade point before weighing the weight loss. I has some worn diamond laps ( flat rotating grinding surfaces I use for gemstone faceting, so I tried one) .However , as many would guess, the wear pattern and the weight reduction is not the same pattern as a cent worn in circulation ( much more of the rim is worn off when flat ). So now I am deciding how to construct a &quot; pant pocket wear&quot; device, using the lap with a dense wax layer with a gentle convex curve, covered with a &#039;denim&#039; surface and coated with diamond dust. I need to rework the wax layer to produce a normal wear pattern on the cent and then run a series of wear. Anyone else wants to run with this ~ go for it, I have plenty other things to do. Jim[/QUOTE]</p><p><br /></p>

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