1984 zincoln What do you remember is important about the super thin electrostatic copper plate over a zinc core? And what are you pointing out is an error?
Here is the explanation of what you have Fred Weinberg stated - Quote "The 'o' of oF is weak because it is opposite the Bust of Lincoln - when struck, the metal flows into the larger Bust area of the die, making the design opposite it a bit weaker. This is a VERY common effect on Memorial Reverse Cents......not considered an error coin."closed quote