I'm still really new to collecting so I came seeking input from you folks that are way more knowledgeable than I. To me it looks like doubling but maybe I've been looking at coins for too long today and I'm just seeing something I to want to see. I look forward to your input.
Welcome back! This is NOT a DDO. Just machine doubling. This is an example of the infamous 1969S DDO.
The Mint Mark would not be Doubled because in 1969 it was hand punched onto the Obverse Die. Look at the picture that dwhiz provided of the true DDO variety.
Like Cheech says, they should be close to the same height, see this 1955/55 example and how they blend due to same height.