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<p>[QUOTE=&quot;Oldhoopster, post: 2911538, member: 84179&quot;]Here is a simple explanation that I have picked up over the years from talking, reading, studying, and observing numismatics.&nbsp; I’m surprised it is not written in one of the numismatic glossaries, but I think it explains what some of the “seasoned” members have been trying to say.</p><p><br /></p><p>Burr- During the blanking process, the punch is incomplete and some torn metal remains attached to the blank.&nbsp; Most of these are removed during handling and/or in the upset mill.&nbsp; If the burr remains attached when the coin is stuck, and it’s pressed INTO the planchet during the minting process, it is called a burr.&nbsp; Normally, burrs need to be relatively large to remain attached to the blank and planchet until it gets to the die</p><p><br /></p><p>Fin – The thin edge formed during striking when metal flows into tiny gaps between the collar and die. They DO NOT indent the rim or fields.&nbsp; Folded fins tend to wear off quickly once the coin starts to circulate.&nbsp; Thicker fins DO NOT fold (I believe this is the typical definition of fin), and can be seen as uneven thicknesses of the coin when viewed from the edge</p><p><br /></p><p>Another “error” that is sometime seen is that the copper core is missing, uneven, or missing when looking at the edge.&nbsp; I believe, that this due to the malleable metal “smearing” or being pushed as the coin is the collar is retracted.&nbsp; It’s a minor thing, but if you look at the edges of enough clad coins, you’ll probably come across some where the copper core looks like its missing.&nbsp; I cannot offer proof, but I believe this is a reasonable explanation of this phenomenon. (In the grand scheme of things, it probably isn’t that important anyway)</p><p><br /></p><p>What you’ve been posting have been folded fins.&nbsp; When you consider the high speed minting process and tolerances in the equipment, it’s not surprising to see many of these on new coins.</p><p><br /></p><p>Technically, these are all burr according to the metal working industry, but by using to BURR to describe extra metal left on a mispunched blank, and FIN (or folded fin) to describe what happens during striking, it separates the two, and more accurately describes the method that where each occurs.</p><p><br /></p><p>Enough of this nonsense, I&#039;m joining [USER=11540]@ldhair[/USER][/QUOTE]</p><p><br /></p>

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