Plating didn’t start until 1982. Lighting is a bit weird and it might be messing with how the coin looks.
As I stated looks like Environmental Damage. But sometimes these Cents are plated after the Mint for novelty purposes. Or someone got bored and lightly spray painted it.
environmental damage and then a rock tumbler. The first time my brother went metal detecting. He put his in a tumbler and that is what this looks like to me.