I came across this very worn series 2006 $1 note in the register at work at decided to take it just in case it was worth something, but I can't be sure if this is an actual error, or whether the bill is just so worn down that it has no ink on the face any longer. Please help me figure this out... i've included some pictures for reference... As you can see the back of the bill has little to nothing wrong with it compared to the front which makes me want to believe more and more that this is in fact an error note and not a worn out one but this is why i'm posting photos so hopefully someone else can give me some insight into what i've got here... thanks again
Looks plain worn. If it was an insufficient inking, there wouldn't be fading in a manner on the 2nd and 3rd overprints as in this example.