The MD is usually explained to be flat shelf-like doubling, while hub-doubling usually shows extra thickness, spit-serifs, or notches where the two overlap and are off-set. To me this isn't the typical flat shelf-like MD, but has the extra thickness and notches and looks like a 2 over a 2. It could be MD or DDD, but just not what I'm accustomed to seeing. Thanks.
Just a normal coin. It's your microscope light that's causing the appearance of doubling. It would be thicker than a normal date if it was doubled.
Here is a link to some pics at Coneca's website. These are of several different 2006P doubled die obverse cents. You will be able to tell the difference. http://www.varietyvista.com/01c LC Doubled Dies Vol 3/DDOs 2006 cent (1-8).htm