The numbers and letters are all a little thick and despite looking like a nice deep strike, all the letter and numbers are rounded at the top.
Ask *i2i*. He's smarter than everybody, here (so he thinks!), and he's a big fan of fat letters. Chris
Fat lettering does not always mean doubling. I have seen both fat and narrow letters and numerals on each of the issues of cents since 2010. The doubling comes when you see a notch, in this case it would look more like a slashed letter/numerals and sometimes distorted. They are very often hard to see because of the glare on newly minted coins but easier to see once they have toned some. A good comparison would be to look at the 2014 and 2015 cents listed on Wexler's site at www.doubleddie.com. I do not see this on your coin.
While I don't see any notches like you mentioned, there's definitely something strange about it. It's got some sort of teering or layering going on because I can see these rings around the letters, the rings don't seem to be at the bottom or the top of the letter. I would have just thought this to be machine doubling except I don't think I've seen a single machine doubling since they changed the way the coins are minted and these rings I'm seeing aren't at the bottom of the imprints but rather in the middle of the letters. Almost like it was pressed twice, once on top of the other but with slightly different pressures.
Ok. Since this thread is still fresh, here's another one. Same year and mint. This time I was looking for the notches you mentioned. So I noticed a notch on the 1 in 2018. Rotated around and sure enough it's a line going through the number, but not sure if it's definative. Then I look at Liberty and right down the middle of L and I and a big notch down the back of the B. So, is this it or like it or not even close?
In my opinion, this also does not represent Class IX single squeeze doubling. I think it’s die deterioration. http://www.error-ref.com/doubled-dies/
I think I get it now. Although i gotta say, that looks more like extrusion than doubling. More like squeeze slip movement at the time it's pressed. And I do mean pressed, not struck.