558QP3

Retrograde date display at 12 o'clock, days at 9 o'clock, plus months and leap years at 3 o'clock. Small seconds positioned on the tourbillon axis. Manually wound movement featuring a tourbillon and perpetual calendar. Signed and numbered BREGUET. Caliber 558QP3. 14 ½ lignes, 21 jewels. 50-hour power reserve. Lateral lever escapement with a balance featuring adjustment screws on a Breguet hairspring. Frequency of 2.5Hz. Adjusted across six positions.