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Message:: [QUOTE="desertgem, post: 1588293, member: 15199"] In Margolis and Weinberg's Book, The error coin encyclopedia, in the section on die polishing, it mentions When the die is found to produce defective coins due to a die clash, clog, or fill, the press is stopped and the die is cleaned. The cleaning process will often result in a slight change to the die.    In one operation, a brush with strong wire bristles ...which will not bend or flex,The mint technician actually apply the brush to the die face and works it up and back....which may leabe fine scratch marks on the face of the die, This is considered acceptable and the die is put back into service. Until it wears down, the coins struck by that die will contaon fine raised lines in the fields. p.305 In case of clash indentations or more severe cases, they say I have many coins with die polish lines that do criss cross and not in arcs, that I have no doubts are mint produced. The book noted above has many photographs of mint die preparation, and the only "circular" devices are the grinders they use to make each die Exactly the same height by bunch grinding  a group of them on the bottom so the face is not touched. I do think you are wrong on your statement of no criss-cross and always circular arcs on die polish lines, at least on circulating coins and they are implied to be made by straight line tools and by hand. IMO. Jim [/QUOTE]