A bunch more items have been donated to the 11/16 folk music auction - for details go to http://heritagemusicauction.blogspot.com/ One of the more interesting is a 12-string bowl-back mandolin built by the famous Franz Schwarzer zither company in Washington, Missouri. It is nicely inlaid and, while in need of serious restoration, is still a joy to see. It is complete except for the fingerboard.
Regarding Schwarzer, see:
http://www.historicmarkers.com/Missouri/Franklin_County_Missouri/Franz_Schwarzer_MO8/
http://www.zither.us/?q=node/31
Furthermore, this mandolin was owned by Jackson C. Frank ("He's the most famous folksinger of the 1960s that no one has ever heard of.")
http://en.wikipedia.org/wiki/Jackson_C._Frank
Here is a lesser-known 8-string (restored) going for $285.
If you wish to donate items to the auction, e-mail heritagefolkmusic@gmail.com