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<p>[QUOTE=&quot;oval_man, post: 1499372, member: 22602&quot;]Aslpride, these are contact marks. As was explained earlier, contact marks tend to be singular and suggest that the coin had been &quot;struck&quot; by something; typically another coin. Hairlines are much thinner and fainter, generally. To visualize them, picture the pristine field of a brand-new proof coin. Now imagine rubbing that shiny, reflective field with the corner of a coarse piece of cloth, or even with your fingertip—particularly if your skin is dry. Those actions would leave a small &quot;patch&quot; of very thin, parallel lines on the surface.</p><p><br /></p><p>Gently wiping Plexiglas with a piece of fine sandpaper might also help you to visualize what &quot;hairlines&quot; are. Both &quot;contact marks&quot; and &quot;hairlines&quot; suggest the kind of action that made the marks: the first, heavier and more forceful; the second, more delicate.[/QUOTE]</p><p><br /></p>

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