The split-seconds chronograph is one of the three most difficult complications to master, alongside the tourbillon and the minute repeater. It takes a highly sophisticated mechanism to control the two chronograph hands, one of which may be stopped to measure an intermediate or lap time or retain a reference time while the other continues its course unaffected, even by fractions of a second. When released again, the split-seconds hand instantly catches up with the primary hand and the two stacked hands move on together.
Split-Seconds chronograph. Instantaneous 30-minute counter. Seconds subdial. Tachymeter scale. Dial: authentic black enamel, gold applied Breguet numerals. 18K gold dial plates. Alligator strap with square scales, hand-stitched, shiny black. Case: platinum. Interchangeable full back and sapphire-crystal case back. Water resistant to 30 m. Case diameter: 41 mm. Height: 13.56 mm.
Split-Seconds chronograph. 30-minute counter. Seconds subdial. Diameter: 29.6 mm. Height: 7.1 mm. Parts: 312. Jewels: 34. Power reserve: With the chronograph disengaged: min. 55 hours - max. 65 hours. Balance: Gyromax®. Vibrations/hour: 28 800 (4 Hz). Balance spring: Breguet. Hallmark: Patek Philippe Seal.