The A. Lange & Söhne Datograph Perpetual ~ Functions: Chronograph - Perpetual Calander ~ Case: 41mm - White Gold - 13.5mm Thick ~ Water Resistance: 30M ~ Movement (Calibre L952.1): 36-Hour Power Reserve - Hand-Wound - 18,000 vph Frequency - 36 Jewels - 556 Parts ~ MSRP: £80,000