Jim -- I wish I knew how to place a value on a Novachord.  Mine
was given to me, in complete and partly working condition, and I gave
it away.  It's like an Aeolian Orchestrelle: too big and too much
maintenance to appeal to very many collectors.

But since you have a willing buyer, you should ask at least a few
hundred, maybe a thousand, for it.  On the other hand, since this buyer
represents a museum that will restore and care for the instrument, you
should give him a better deal -- maybe for free?  Somewhere in between
those extremes.

Musically and technically, it's a very capable and powerful instrument.
Useful mostly for pop and dance work of its time, sort of Hammond organ
style music, but still a fascinating medium.

Be sure to check that there are TWO chassis, one over the other, in the
pedestal in the center.  One is the power supply for the main chassis
of tone generators (that looks like a big bedspring box), and the other
is the audio power amplifier for the two 12" speakers that should be in
the pedestal's top.  This thing was designed to fill a LARGE hall!  The
power amp uses four 2A3 triode tubes in push-pull parallel.

Good that you have some documents with it.  I have several 78 rpm
records of Novachord solos, very well played by a good pop organist
who also uses piano style in most places.  The Novachord really is a
hybrid piano and organ, although the keys are not touch-responsive like
a piano -- some quick pumping of the volume pedal is needed to fake it.
But it has sustaining pedals like a pianos.

I'm really starting to miss mine, so I'll quit here.

Best wishes,
Mike Knudsen