To estimate the value of a mixed lot of piano rolls, I would suggest
talking with Dan Wilke, of Buffalo, New York, who for years ran
Q.R.S.'s old piano roll auction.  Dan got to know pretty well what
would sell and what wouldn't and how to value groups of rolls.

Dan doesn't have email, but he can be reached at his home phone:
1-716-825-7266.

Matthew Caulfield
Irondequoit, New York