1937 1 Cent, Hanging 3 With Really Thick And Odd Looking 7

I have been sorting through a lot of my finds and I came across this one I completely forgot about for a month or two, shown on the left is the coin in question, as you can see both coins are in almost identical condition accept the 7, I don't know why but it looks very odd, the top of the 7 is really thick and looks shorter compared to a normal 1937, the tail of the 7 is also thick as well.

I was hoping someone may know why, I was thinking a warn die but the outline of the 7 looks way to perfect and since the condition is fairly decent on this coin I'm really not too sure. All I do know is the longer I stare at it the more questions I seem to have, it might be nothing but I thought I would ask.