A. Lange & Söhne Datograph Perpetual Tourbillon

The A. Lange & Söhne Datograph Perpetual Tourbillon, reference 740.056FE, combines a flyback chronograph, perpetual calendar and tourbillon in an 18-carat white gold case. This limited edition of 100 pieces measures 41.5 mm in diameter and 14.6 mm in height. A dial in 18-carat pink gold has outsize date, weekday, moon-phase, power-reserve and day/night displays. The case has 20 mm between the lugs, a see-through back and a 30 metre rating. Manual-winding calibre L952.2 comprises 729 parts, with a 50-hour power reserve and a frequency of 18,000 semi-oscillations per hour. A dark brown alligator leather strap closes with an 18-carat white gold folding clasp. The tourbillon has a patented stop-seconds mechanism.