ILoveStamps is on the right track. It is a machine cancel, but I suspect the cancel is actually from the 1880s, one of the early "experimental" cancels from either American Postal or International. These can date as early as 1884.
Which when you think about it, is only 23 years from the original date of issue, so it is not too astounding, but it would be quite interesting to see one used on cover with an early machine cancel.
