Has some of the characteristics of a die crack, but with so many plating problems on these Zincoln's, it is more likely that. JMHO
I think Abe just slept on it crookedly last night. Looks like a chip, but as Mountain Man said, with zincolns plating issues are always possible.
Most likely a die chip,never heard of that before if it even exists,and I think Mr.Lincoln shaved his beard enough.