It's impossible to list them all here.
There are many "doubled ear" obverses. These are doubled dies and are not just machine doubled.
Not in any particular order, you have the:
High leaf , low leaf varieties on the Denver Mint, Wisconsin quarters
Minnesota "extra trees" varieties (I think there are better than 120 different ones.
There are some Oregon quarters with extra tree limbs.
There are doubled dies on the New Mexico quarters that have to do with the center of the design on the reverse.
Washington D.C quarters: Duke Ellington has extra fingers on his hand or extra keys on the piano. Both are doubled dies.
As far as errors....
Utah quarters are known to have
Cuds to the right or left side where the locomotives are closest to the edges.
And on and on....
I hope this gives you a few places to start.
Thanks,
Bill
Edited by foundinrolls
07/29/2009 10:38 pm