Case in 18-carat rose gold with the caseband engraved with a musical score. Full caseback. 48mm diameter. Welded lugs with screw bars. Water resistant to 3 bar (30m).
Rotating dial, platinum plated and engine-turned. Individually numbered and signed BREGUET. Hours chapter with Roman numerals on the flange. Breguet open-tipped hands in polished steel. The centre of the dial rotates completely when the music is activated. On/off indicator for the sound in an aperture between 9 and 10 o'clock. Power-reserve indicator for the music in an aperture at 3 o'clock.
Self-winding movement. Numbered and signed BREGUET. Cal. 901, 17 ¼ lignes, 59 jewels. Power reserve of 45 hours with sound on and 55 hours when set to silent. In-line Swiss lever escapement. Flat balance spring in silicon. 4Hz frequency. Adjusted in six positions.