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