A. Lange & Söhne Datograph Perpetual

The A. Lange & Söhne Datograph Perpetual, reference 410.032 E, combines a chronograph and perpetual calendar in an 18-carat pink gold case. The case measures 41 mm across and 13.5 mm high, has a see-through back and is water resistant to 30 metres. The silver dial carries an outsize date, day/night indicator, moon-phase display and day-of-week, month and leap-year indications. The calendar needs a one-day correction only in 2100, and the chronograph measures to one-fifth of a second. An alligator leather strap fastens with a pink-gold pin buckle. Manual-winding calibre L952.1 contains 556 parts, beats at 18,000 semi-oscillations per hour and has a 36-hour power reserve.