You've ignored one expert. Read what this one says about these things before insulting the next.
2000 D South Carolina State Quarter. I began collecting coins as a hobby for about a year now and found this quarter that could be a multiple error coin. I've researched these errors on state quarters and thus far I've come across a few possibilities.
An improperly annealed planchet error. The dulled flat appearance and a trail like appearance on the devices resembles such error.
Doubled die error on both Obverse and reverse. The devices have a weakened appearance so this could also



