The official cause of woody's (new or old) is unknown, although there is evidence that an improper alloy mix between the copper and zinc causes the metals to tone differently.
Being that their collectibility is limited to woody enthusiasts and MIGHT carry a premium in higher graded red brown examples, let's just say that if it looks like a duck, walks like a duck......it's a duck, or woody in this case.
However.....I would love to hear how the term "rolling lines" came to be. Because if they were caused by grease on rollers then wouldn't the lines be limited to one side of the coin? The side that was touching the rollers? Not to mention the extreme heat generated during the striking process would almost certainly get rid of them. Just my Two Cents.
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