to the CCF!
It looks like it could be a small strike through. Something blocked the matte finish from being transferred to the coin and left a small smooth area. I don't think it something stuck to the coin because it has a mirror finish, as seen in the first image, but I don't know if it would add to or decrease the coins value.
The first US coin motto was found on a 1792 half disme
and read: "LIB (erty) PAR (ent) OF SCIENCE & INDUSTRY"