The latest issue of "Acoustic Guitar" magazine has a feature on Twain's Martin guitar. I don't have the magazine with me at the moment, but I believe the guitar was built by C.F. Martin (the founder) in 1835 and purchased by Twain ca. 1861. Beautiful parlor guitar in excellent condition--the magazine has a very nice picture. I'd be interested in any further information about this guitar or Twain's reputation as a guitarist. Thanks, Tim