Sorry for the last mail with so many stupid signs… Here again: There is a 15-course lute by Jonas Elg. See the paper by Kenneth Sparr:
Jonas Elg: An Eighteenth-Century Lute and Violin Maker in Stockholm, Sweden, and his 15-course Baroque Lute. Galpin Society Journal LXV March 2012, pp. 23-59, 168-172. Also presented as a paper at The American Musical Instrument Society, 40th Annual Meeting, The Musical Instrument Museum, Phoenix, Arizona May 18-22, 2011. All the best, Andreas To get on or off this list see list information at http://www.cs.dartmouth.edu/~wbc/lute-admin/index.html