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<p>[QUOTE=&quot;GDJMSP, post: 2704326, member: 112&quot;]The answer to the first part of your question has already been given, it&#039;s 2 strikes, (or more because some are struck more than twice) at higher pressure that produce the squared on edges (or corners if you will) of the rim. </p><p><br /></p><p>The answer to the second part is the rim would have rounded edges/corners. </p><p><br /></p><p>This is why. The rim of both a Proof and business strike die is shaped or formed exactly the same. One is not squarely cut and one rounded off - they are both squarely cut. But what I think some folks don&#039;t realize or seem to understand is that the rim is the lowest part of the die. </p><p><br /></p><p>Now think about that for a second. And when ya do, think about this. When one examines coins and they look at the highest points of the devices, sometimes the details of the high points are not as sharply or fully formed as they could be. And when we see this we say it is due to a weak strike.</p><p><br /></p><p>Well, it&#039;s the same kind of thing with the edges/corners of the rim on business strike coins because the rims are - the lowest part of the die, highest part of the coin. And the edge/corner of the rim is rounded off because it has not been fully struck. There just wasn&#039;t enough pressure to push the metal into the deepest recess of the corner of the die and create that sharp squared off edge. Just like sometimes there isn&#039;t enough pressure to fully form the devices.</p><p><br /></p><p>With a Proof, there is enough pressure the fill the very edge of the corner because it higher to begin with, and it is struck twice or more times.</p><p><br /></p><p>As for the part played by the collar in all this, it is the collar that contains that higher pressure and allows the sharp, squared of corners of the rim to fully form. </p><p><br /></p><p>Of course the collar does exactly the same thing on business strikes, it contains the pressure. But on business strikes there just isn&#039;t enough pressure to fully fill that corner.[/QUOTE]</p><p><br /></p>

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