It seems too straight to be a die crack. I think it's a die abrasion from some aggressive die polishing. It does seem to be a little off-center or maybe misaligned to the K-2 position on the obverse.
I can see the remnants of Lincoln's shoulder in the columns of the Memorial, with lots of die polish marks on both sides. The polishing was so heavy that it left a hazy halo or 'aura' around Lincoln's portrait.
Here's a LMC Clash overlay. Can you locate any other clash marks with the coin in-hand?
ANA ID: 3203813 - CONECA ID: N-5637 Clean a coin that may be worth collecting? Please DON'T! When in doubt, leave it dirty!!
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