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<p>[QUOTE=&quot;GDJMSP, post: 1921256, member: 112&quot;]That&#039;s debatable. It is generally agreed that heat is what causes the blisters, but the heat from annealing is much greater than the heat generated from the strike, and thought to be the culprit. So they would be there before the strike.</p><p><br /></p><p>Also, most blisters are round or roundish in shape and haphazard, not in a parallel series of narrow lines. I readily agree that round blisters typically do not break, nor is it uncommon to find them on the devices, and in the fields. </p><p><br /></p><p>As I said earlier, whatever it is that caused the lines, I definitely suspect they were on the zinc planchet before it was ever plated. If you look closely, the lines left of the bust line up with those on the right. In other words, they are one continuous line. And because the zinc is so soft, that would explain why the lines are not visible on the devices - they were obliterated by the strike.</p><p><br /></p><p>That is the only thing that makes sense to me. Even so, that is conjecture as I have never seen a coin like this.[/QUOTE]</p><p><br /></p>

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