Patek Philippe caliber 86-135 PEND S IRM Q SE

The Patek Philippe calibre 86-135 PEND S IRM Q SE is a manually wound manufacture movement developed specifically for complicated desk clocks. The rectangular movement measures 135 × 86 mm and has a height of 28.55 mm. It consists of 912 components, is fitted with 83 jewels, and delivers a power reserve of 31 days. The movement operates at a frequency of 28,800 semi-oscillations per hour (4 Hz) and is equipped with a Gyromax® balance paired with a Spiromax® balance spring. A constant-force mechanism is integrated to stabilise energy delivery, enabling a rate accuracy of approximately ±1 second per day over the full running period. Calibre 86-135 PEND S IRM Q SE incorporates a perpetual calendar with indications for day, date, month, leap-year cycle, day/night display, and moon phases, the latter calculated to deviate by one day only after 122 years. A weekly calendar is included, with the week number displayed via a mobile frame in accordance with ISO 8601. Timekeeping functions comprise hours and minutes displayed on a subsidiary dial, a large central jumping seconds hand, and a central power-reserve indication calibrated for the full 31-day autonomy. The movement is manually wound via a removable key and features a stop-seconds mechanism that halts the seconds hand during time setting. Finishing and construction meet the requirements of the Patek Philippe Seal, covering technical execution, precision, and long-term serviceability.