2009 Lincoln Extra Thumb?

Several collectors have identified doubled die varieties for the 2009 Lincoln Cent Formative Years design.
The doubling occurs on the reverse of the coin, around the area of Lincoln's hand, which holds the book. The first variety shows a completely separate "extra finger" between Lincoln's thumb and index finger. This one is the most visually dramatic and might get the most attention. The second variety shows doubling on Lincoln's thumb. The third shows an "extra thumb" just above Lincoln's index finger. The fourth variety shows an extra finger just below the thumb, but not as dramatically as the first variety.

The rarity of these Doubled Die Formative Years Cents still remains to be seen.