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<p>[QUOTE=&quot;GDJMSP, post: 679305, member: 112&quot;]Some of your thinking is a little off. Business strikes, coins struck for use in circulation, do not have mirror fields. Yes, there was a time when some did, but that was long ago, over 100 years, and only very few were what are called DMPL (Deep Mirror Proof Like).</p><p><br /></p><p>Your questions are lot more complicated than you might think. But that is just because minting techniques have changed so much over the years. But in simple terms there are only 2 methods of manufacture for coins - Proof and business strikes.</p><p><br /></p><p>Proofs and only Proofs will have typically have the mirrored fields and frosty devices. Business strikes will not have them. </p><p><br /></p><p>Proofs will have much better detail because they are struck at greater pressures and they are always struck at least twice. Business strikes are struck at lower pressures and struck only once.</p><p><br /></p><p>Proofs, unless they have entered cicruclation, will rarely have marks or dings all over them. Business strikes almost always have marks and dings all over them.</p><p><br /></p><p>Proofs will have square rims with sharp edges. Business strikes will have rounded rims with soft/eased edges.</p><p><br /></p><p>Proofs will exhibit a luster that is highly reflective and that cartwheels in a thin line of reflected light when turned under a light source. Business strikes will have a non-reflective surface and the lustrer will cartwheel in a thicker, wider line of reflected light, much like the spokes of a wagon wheel spinning very fast, when turned under a light source.</p><p><br /></p><p>Those are the general ways a Proof can be distinguished from a business strike. Now if you wish to get more specific, then you will have to pin down the time periods you wish to discuss.[/QUOTE]</p><p><br /></p>

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