Here is the 50 that might be an error? I'm guessing just spend it but I didn't know so I figured I would throw it up here. It's pretty beat up. What I THOUGHT the error MIGHT be is the serial numbers only on the bottom right seem to have moved on the press. Here is the 20 with the step down. Still fairly crisp but definitely circulated.
Personally, I would consider that very minor. I have seen them posted on ebay but I can't recall if they sold or not. Missing digits or stuck digits get my interest because they are much more dramatic.
