I suppose it might be worth a little more than face value if the signature proves authentic and the person who desires it is an autograph collector, but the question is how much more? And how much in demand is an original signature of a Treasurer of the US on top of his/her printed signature? Unless one is an avid collector of such scriptophilia or autographs, there isn't a real big market. A long time ago, I had an Ivy Baker Priest (US Treasurer 1953-1961) on a $1 silver certificate obtained by my father. I just couldn't peddle it and probably would have merely spent it except my wife got to it first.
Speculative on my part, but I'm guessing the value of the bill would be a couple bucks, postage not included. I could be wrong. But as a single piece (as opposed to a larger collection of same), I don't see it having much value over face.
Now, if I had a note signed by Salmon Chase (1st Secy of the Treasury under Lincoln) instead of a nobody, then maybe I'd have something of value.
However, each of us to our own. I used to collect empty Bic pens. Extremely low investment but also a really, really poor value appreciation. When I tried to sell my collection, I got zero takers. What a surprise.
