I just saw a Martin employee uke on the Antique Roadshow. It was in beautiful condition and unfortunately they didn't play it so we can hear how it sounds. I think they underappraised it at 4k. Here is the link on their site - it has the transcript and everything, but the vid clip will be available tomorrow.
http://www.pbs.org/wgbh/roadshow/archive/200806A45.html
http://www.pbs.org/wgbh/roadshow/archive/200806A45.html