CH 28-520 C

Mono-counter chronograph featuring 60-minute and 12-hour displays, plus a date. Measures 30 mm in diameter and 6.63 mm in height, comprising 308 parts, 13 bridges, and 35 jewels. Offers a power reserve between 45 and 55 hours, a 21K gold unidirectional central rotor, Gyromax® balance, 28,800 vph (4 Hz) frequency, and a Spiromax® balance spring, all certified by the Patek Philippe Seal. Chronograph: Column wheel.