Wow. I've seen the "original" (which you have?) and have always assumed - correctly or not - that it's a proof or pattern created to test the actual true non-mule type that would be seen in 1927. By the way, D+d cannot be a mule, unlike the actual 1926ME - it's what the 26ME WOULD have been if they hadn't been in such a hurry to 1) get the small supply of 1926 pennies where they were unexpectedly needed, and 2) were fully resourced supervising the changeover to the Modified Effigy for all denominations, plus preparing the new reverses for 1927.