Found exclusively on cents with a zinc core and copper plating (all cents 1983 and on), this form of "doubling" can often be found on the dates of early 1990s cents, and on the reverse of many cents as well. Split -plate doubling occurs when the copper plating on the coin splits open around certain design elements, revealing the zinc below. They can be identified by the appearance of exposed zinc and a rippled appearance that is found almost exclusively at the tops of letters if you are looking on the reverse.
At this point there is no official phrase for this phenomenon; web searches lead Plating Split-Doubling to Ken Potter and Split-Line Doubling to Mike Diamond, but it is unclear who coined either term. The characteristics are: a split in the copper, revealing a light blue to greenish area (which is exposed zinc), that shadows a device and makes it appear doubled. http://goccf.com/t/357614 https://www.lincolncentforum.com/pl...ne-doubling/
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