Re: instrumentation on the title song of "The Last Waltz"

RE:
<< I'm trying to find out what the instrument is that Mr. Robertson was
playing on the title song of "The Last Waltz" at the end of the movie?
  A double necked instrument if I saw right. Guessing something South
American. >>

It's a "harp guitar". They were made by Gibson (and other companies) many
years ago.

I believe the extra "neck" is acutally an extra course of bass strings,
that
can either be plucked by hand or will resonate in sympathetic frequencies
to
the "regular" strings.

Not "South American" at all.

I believe there are still a few small music shops (at least one in the
Northwest) that cater specifically to these instruments.

- John