The date on the right is part of the signature, so it was probably just left as-is when they used it for something else later on and added the copyright info. Happens on comic covers sometimes if an artist includes the year they drew it in their signature and it's not published until the next.
Makes sense! Can't say that I've seen that happen on any other of their art though.
11-11-2014, 10:09 PM
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