From the official description of Girard Perregaux: Opera Three is an extremely refined musical watch capable to remind the passing time with a melody. Its mechanism works on the principle of a music box. Its heart is a miniature carillon with a keyboard of 20 blades and one drum set with 150 hand-assembled pins. When it turns, the drum lifts the keyboard keys, to play a complete melody. As a delicate detail, Opera Three has a small lever on the side of the case for choosing between two melodies: Mozart's A Little Night Music or Tchaikovsky's Swan Lake. Another lever with three positions can disconnect the sound, make the melody play upon demand or activate it for each hour. The dial is characterized with a small second at 6 o'clock and two indicators: the power reserve of the carillon and the selected melody. This never offered at auction before watch, is a rare opportunity to acquire a musical wristwatch in unworn, brand new condition