Dear Wolfgang,  I suggest you have a look at the listing of museums I
made for the Web site Musica Mecanica (in English, French and German):

    http://www.cnam.fr/museum/musica_mecanica/

You will find more precisions about the ca 20 mechanical music museums
in Japan in some good articles and maps from the MBSI Journal:

- January/February 1995, p 41 (listing and map, by Murakumi Taizou)
- September/October 1995, pp 19-27 (Music boxes in Japan,
  by Don and Jackie Day)
- January/February 1996, pp 25-27 (The music boxes in Japan to-day,
  by Murakumi Taizou)

I wish you happy new year and a nice trip !

Best regards,

Philippe Rouille (Paris, France)