While the records of the Regina Music Box Company, Rahway, New Jersey,
have been preserved by the MBSI (Musical Box Society International),
so that the shipping date and destination for Regina disc boxes can be
furnished to owners who send the information to the MBSI, I don't know
of any similar data source for boxes made by Symphonion Musikwerke,
Leipzig.

Symphonion was making disc boxes from 1885 into the first decade of
the 20th century, when their business gradually evolved into making
phonographs.  Q. David Bowers' "Encyclopedia of Automatic Musical
Instruments" pictures on page 216 a Symphonion musical clock which
uses the No. 20 disc, at 11 cm. (4-1/2") the smallest disc made by
Symphonion and one of the smallest made by any disc box company.

Bowers says that the musical clock was made in quantity around
1900-1905 in both a center-drive and an edge-drive model.

Matthew Caulfield
Irondequoit, New York