The split-seconds chronograph Reference 5370 is available in its very first rose gold version, enhanced by a brown Grand Feu enamel dial with subdials and tachymeter scale in beige champlevé enamel. This decoration with its unalterable colors is hand-crafted on an 18K gold plate. A Grand Complication much sought-after by connoisseurs, this model houses CHR 29-535 PS caliber combining traditional construction features (manually wound, column wheel and horizontal clutch) with seven patented innovations, including one for the revised split-seconds mechanism. The shiny dark brown alligator leather strap is fitted with a new patented triple-blade fold-over clasp.
Watch
Manually wound mechanical movement. 
Caliber : CHR 29-535 PS.  
Split-seconds chronograph. 
Instantaneous 30-minute counter. 
Small seconds.
Dial : Grand Feu brown and beige enamel, rose gold applied Breguet numerals. 
Tachymeter scale. 
18K gold dial plate.
Case : Rose gold. 
Case diameter: 41 mm. 
Thickness: 13.56 mm. 
Water resistant : 30 m. 
Interchangeable solid and sapphire crystal case backs.
Strap : Alligator leather with square scales, shiny dark chestnut. 
Rose gold patented triple-blade fold-over clasp.
Split-Seconds chronograph. 
Diameter: 29.6 mm. 
Thickness: 7.1 mm. 
Number of parts: 312. 
Balance spring: Breguet. 
Frequency: 28,800 semi-oscillations/hour (4 Hz). 
Power reserve with the chronograph disengaged: min. 65 hours. 
Hallmark: Patek Philippe Seal.