The definitive book on singing bird boxes is "Mechanical Singing-bird
Tabatieres", by Geoffrey T. Mason, published by Robert Hale, ISBN
0 7090 6303 2.  This even has a colour picture of a Rochat box on the
front cover.

Mr. Turner should consider himself very lucky indeed to have acquired
such a box as this maker is amongst the best manufacturer of such
mechanisms.  An early Rochat box is worth a considerable amount of
money.

It is imperative that if any work is to be done on this box it is
only entrusted to a person with a proven track record of working on
the finest singing bird boxes.  The average clock or watch repairer
wouldn't know where to start and neither would most musical box
restorers.  Get references before entrusting such a delicate and
valuable item to a restorer.

Best wishes,
Nicholas Simons
Great Britain