It means either the USPS (not likely) or a Customer (likely) put the 2013 stamp on the envelope and submitted it for the DCP cancellation (likely with a stack of other envelopes). Either way, it is an item of 'curiosity' with minimal value if a buyer could be found.
I am with the ones who see this as a curiosity rather than something with additional value for being an "error". My reasoning is that such a cover could have been created by anyone who wanted to do so.
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Posted 11/22/2015 4:08 pm
