Very cool card. I also collect those type of errors. That type is caused by loading the sheets backwards into the printer. As an example there are 12 possible backs that can be on a 1987 Topps card. The most different backs I have for a single front is 4.
EDIT: There are actually way more than 12 possible backs on the 87 Topps card I only included fully printed versions and no blank back or progressive color back cards.
Last edited by bnorth; 02-24-2014 at 10:25 AM.
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