Breguet caliber 581DPE
Self-winding movement with running equation of time, perpetual calendar, tourbillon and 80-hour power reserve, Cal. 581DPE. Numbered and signed Breguet. 16¾ lignes. 57 jewels. Silicon escapement wheel and inverted lateral lever with silicon pallets. Silicon balance spring. Balance frequency 4Hz. Adjusted in 6 positions.
Days of the week in an aperture between 10 and 11 o’clock. Months and leap-year cycle in an aperture between 1 and 2 o’clock. Retrograde dates indication on an arc running from 9 to 3 o’clock. Power reserve in an aperture between 7 and 9 o’clock. Small seconds and equation of time cam on the tourbillon axis.