Value of 7-track TU10

[Noel Chiappa]

So what do people think the (monetary) value of a 7-track TU10 master drive
is? I have no idea what these older vacuum-column drives are worth - don't
recall ever seeing on for sale. This one is in good condition, and has all its
Flip Chips.  The 7-track is a plus in some ways (rarer), and negative in
others (can't read old 9-track tapes, which are probably more common than
7-track).

    Noel