I think I have a 5c with a very similar affliction. I will check when I get home from work. Sure about the right margin at least. Not too stunning. I scanned these on 'magazine' with my Canon Lide 400 to darken them up a touch. It appears to be a pretty regular dashed line running right through the date but that could be scanner hocus pocus.
I've always loved this design. There is a guy standing near the bottom by the canoe that looks like he knows his picture is being taken. Dude leaning on the musket.
The re-entries site mentions hairlines as being found frequently on issues of this series. I have around 70 mint of the 1c and noticed hairlines on 4 of them, so around ~6% just one from this one sample. Haven't checked other values in the series as yet.