It's a keeper IMO. However, it would be better if it were a $1 FRN. Once you start getting into the higher denominations people are more hesitant to save those that are only on the cool factor and aren't really fancy serial #'s.
The bill is nice condition and the S/N is neat but a twenty is hard for most people to keep. I would but that’s me and only because I can.
Interesting at best, don’t really see a premium here, but maybe putting in a picture frame in the office as conversation piece
The issue, is it’s only worth what’s someone is willing to pay for it and that goes for just about anything.