I've been having a lot of fun with this 55-S Lincoln roll. I found 3 Green Neon/copper cents, two U-R-I-B-U-S Ribs, three cracked die cents, four S/S/S, ten S/S, four with extra wheat kernels, and one coin that first appeared to be a RDD. According to Wexler, the coin is actually an MD (
Mechanical Doubling), This form of doubling has also been known by a number of different names over the years. It has been referred to as "ejection doubling", "
Machine Doubling", "
Strike Doubling", "shift doubling", and "shelf doubling". termed by some on Coin Forum as being mechanical damage. Thank you all for your help on this!