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<p>[QUOTE=&quot;Hommer, post: 2904485, member: 73266&quot;]A burr is caused by or left from improper or jagged cutting. After blanks are punched from sheets, they are ran through an upsetting mill, for purposes of which are two fold. One it squeezes the blanks to upset enough material around the edge to form the rim when struck, the other reason is to properly size the blank. After this process, the blanks are called planchets. If the sheet is of improper thickness, meaning thick and thin spots, the upsetting mill will push the too thick metal up and slightly fold it over. When struck, the excess metal will be folded into the coin but will be formed to the contour of the rim or coin. They will be visible but not raised as your coins show.</p><p><br /></p><p>Metal raised above the rim of the coin, after striking, is either from a break in the die or collar, or from being squeezed into the small gap between the die and collar. You can call it what ever you want but it doesn&#039;t change the reason it&#039;s there.[/QUOTE]</p><p><br /></p>

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