The Z is counterstamped onto the coin. Relatively common to find these when CRH. The issue on the back may be related to rust on the reverse die or perhaps hydrozincite (zinc rot). These can appear at blemishes under the plating and detectable with a toothpick to see if the plating (copper) moves. If this is a copper cent (3.1 grams), probably rust on the die or perhaps struck through something. Let's wait for an expert to weigh in.






















