That copper plated piece of zinc is very ugly. I dare say that some of what you think of as errors are a
result of environmental damage. Any time moisture, especially if mildly acidic, penetrates the very thin, imperfect plating, the result can be bubbling, pitting, caving, and a whole host of other visual indicators demonstrating corrosion of the underlying zinc, as well as the copper plating. Based solely on the images, I do not think you have anything but a zincoln that has been in the ground at least a few months.
