Self-winding
28-520
This self-winding flyback chronograph caliber features a distinctive 60-minute counter at 6 o'clock. It can also be combined with additional complications such as the World Time or the patented Patek Philippe Annual Calendar.
CH 28-520
Features: Flyback chronograph. Central chronograph hand. 60-minute counter. Diameter: 30 mm. Thickness: 5.3 mm. Number of parts: 259. Number of jewels: 32. Power reserve: min. 50 hours – max. 55 hours. Winding rotor: Rotor central en or 21 ct. Balance: Gyromax®. Balance spring: Spiromax®. Distinctive sign: Patek Philippe Seal.
CH 28-520 HU/524
Features: Flyback chronograph. Central chronograph hand. 30-minute counter. World Time. 24-hour and day/night indication for all 24 time zones. Diameter: 33 mm. Thickness: 7.97 mm. Number of parts: 355. Number of jewels: 36. Power reserve: min. 50 hours – max. 55 hours. Winding rotor: 21K gold central rotor. Balance: Gyromax®. Balance spring: Spiromax®. Distinctive sign: Patek Philippe Seal.
CH 28-520 HU/530
Features: Flyback chronograph. Central chronograph hand. 30-minute counter. World Time. 24-hour and day/night indication for all 24 time zones. Diameter: 34.5 mm. Thickness: 7.97 mm. Number of parts: 355. Number of jewels: 36. Power reserve: min. 50 hours – max. 55 hours. Winding rotor: 21K gold central rotor. Balance: Gyromax®. Balance spring: Spiromax®. Distinctive sign: Patek Philippe Seal.
CH 28-520 IRM QA 24H
Features: Flyback chronograph. Central chronograph hand. 60-minute and 12-hour monocounter. Annual Calendar. Day, date, month and day/night indication in aperture. Power reserve indication. Diameter: 33 mm. Thickness: 7.68 mm. Number of parts: 435. Number of jewels: 40. Power reserve: min. 45 hours – max. 55 hours. Winding rotor: Rotor central en or 21 ct. Balance: Gyromax®. Balance spring: Spiromax®. Distinctive sign: Patek Philippe Seal.
