I would guess the Regina is one of the most common of disc music boxes.
They were cranked out by the thousands around the 20's (someone may
correct me on the date.)  Discs are fairly common and reproductions
(discs only) can be found.  I added one to my collection a few years
back.  Came with a very nice matching stand which has a drawer to hold
the discs.  What condition is yours in?

Jim Quashnock