PCGS 1907 Indian cent split before strike. The coin is struck on a planchet that split in half before strike, resulting in a coin thinner than normal, and weighing about half the weight of a normal...
PCGS 1951 wheat cent struck on a silver dime blank. The coin weighs 2.54 grams, and is silver, instead of copper. The coin is struck on the blank intended for striking into a Roosevelt dime, instead...