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<p>[QUOTE=&quot;CygnusCC, post: 7626279, member: 120299&quot;]Thanks [USER=105098]@John Burgess[/USER], that sounds consistent with what I&#039;ve been reading. Also it seems, at least as far as US copper pennies go, the improper alloy mixes have been from before the mid-1900&#039;s and the roller lines have been from the 1970&#039;s on. I&#039;ll keep that in mind for future hunting.</p><p><br /></p><p>As a side note, now that I&#039;ve noticed the roller lines on that 81, a large portion of zincoln coins I&#039;ve seen seem to have those striations you show on your 2005. Not multicolored, but ridges - I was starting to think that was part of the business strike background and was an intentionally created relief element in the field. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /> Either that or some weird die polishing side effect.</p><p><br /></p><p>Edit: added a few examples I just now snapped in the attachments. Apologies to all for not making them full screen but I didn&#039;t want to take up the space in this thread for them (also it makes it easier to compare line directions when you flip through them). <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /> I wonder if there&#039;s something about the thin layer of copper that makes it more prone to this type of distortion...[/QUOTE]</p><p><br /></p>

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