Hi MMDigest,  I have a roll in my collection (34 rolls <haha>) named

  50816 The Mikado, Potpourri, A.P. Sullivan & O. Sullivan

It is a Hupfeld Animatic roll, which had theming on it and is handplayed.
It had a signature that I identified as O. Sullivan, but I am not
completely certain, though it seems logical considering the composers.
Scans of my roll labels will be on my web site in a few weeks.

Regards, Niels Berkers
http://pianoman1984.t35.com/