While people can compare to your picture, the penny in the tread technique is really supposed to be with Lincoln's head down...when it only reaches the top of his head you're down to 2/32". Reaching the top of Washington's head on a quarter is 4/32" and the top of the Lincoln Memorial on the back of a penny is 6/32".
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2013 Cadillac V-Wagon, RIP Z
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