I came across this 1988 penny and it appears to be somewhat doubled on the reverse. The letters in UNITED STATES appear to have a line in the middle of each letter. The ONE CENT I'm not sure about. The lower left of the monument appears to be slightly rolled up or something. The upper left of the monument appears to be doubled. A couple of columns appear to be slightly doubled as well. Is this just Mechanical doubling? Sorry for the poor quality pics.
I will say your coin has Machine Doubling. The shelf-like doubling on the bottom - Left of ONE C and bottom of memorial is quite pronounced. MD makes the top area of the design smaller.
I used to find stuff like that and get tingles up and down my spine. Then, a friend told me about the many kinds of worthless doubling. My spine hasn't tingled in a loooooonnnnggg time. I've never found the real deal. Sometimes, I wish that friend had never said anything. Ignorance is Bliss.