Unfortunately, the date of E78 is made up - just something hobbyists have claimed to be true without an evidentiary basis. There's no way to know if it's 1908 or 1910 or 1912. Same for E26. I think E8 is in the same boat; there is no evidence for 1910 as opposed to another year in this period.
I would expect it is more likely it was just a test sheet, or they ran the wrong sheet(s) through the printer for the second side than that E78 was on the same exact shape and the sheet was correct but run upside down. This can't be eliminated though, it could look like E96.
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