Seem like the whole reverse has that line from outside the MB ..Plating ?. I posted one similar but 2006 couple days ago and Mr. Coop and E-n-V said same thing
Note the obverse. The obverse id is polished with N-S lines on the die, looks like the same thing happened on the reverse as well. Not a doubled die. On this post 1999 cents you will find more of the doubled dies, on the center part of the cents. They are called bar cents. The 1994 cents are showing more of the extra columns on that years coins: http://doubleddie.com/352322.html
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