Open Discussion

The punch is not what caused your doubling. This is doubling from the striking of the coin itself, which is Machine Doubling. It is very common for this to occur on silver quarters and half dollars, and here's the reason why:

Because the entire design on the reverse of these coins is carefully beveled to make sure the coin pops out of the die after being struck, none of the other reverse elements are doubled in this very close and simple form of Machine Doubling. The mintmark, on the other hand, is placed into the die by hand, and is not always beveled with such a low angle, thus has a tendency to get stuck in the die. The force of the strike, a possibility of die bounce, and the mintmark sticking to the die upon eject can all cause slight doubling...but it only affects the mintmark.