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<p>[QUOTE=&quot;Hommer, post: 8153054, member: 73266&quot;]Some people call it a burr but fin is a better term. A burr is extra metal left after cutting and there are cutting errors on coins but they occur during the blanking stage where the die that punches the blanks out of the sheet has became dull.</p><p><br /></p><p>A fin or finned rim occurs when metal is pushed into the gap between the anvil die and the collar die. It is common on proof coins because of high striking pressure not usually used on coins struck for circulation. The fins are exceptionally thin and are easily broken off. I coin with the fin still attached has obviously been carefully handled and shouldn&#039;t discount the grade.[/QUOTE]</p><p><br /></p>

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