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<p>[QUOTE="Oldhoopster, post: 10777753, member: 84179"]They are roller lines from the planchet rolling process and its not uncommon on late 70s early 80s cents. Im Guessing its due to poor cleaning during the process that results in oils and/or contamination being left on the ingot and stain the planchet as they tone over time</p><p><br /></p><p>Notice how all the lines are parallel and consistent. An improper alloy is due to poorly mixed, random regions in the alloy melt, so you wouldn't expect this consistency. While woodies do have an elongated appearance due to ingot rolling, if you look closely, youll see that size/shape varies on a small scale.[/QUOTE]</p><p><br /></p>
[QUOTE="Oldhoopster, post: 10777753, member: 84179"]They are roller lines from the planchet rolling process and its not uncommon on late 70s early 80s cents. Im Guessing its due to poor cleaning during the process that results in oils and/or contamination being left on the ingot and stain the planchet as they tone over time Notice how all the lines are parallel and consistent. An improper alloy is due to poorly mixed, random regions in the alloy melt, so you wouldn't expect this consistency. While woodies do have an elongated appearance due to ingot rolling, if you look closely, youll see that size/shape varies on a small scale.[/QUOTE]
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