A. Lange & Söhne Datograph Perpetual Tourbillon Honeygold "Lumen"

The A. Lange & Söhne Datograph Perpetual Tourbillon Honeygold "Lumen", reference 740.055FE, combines a flyback chronograph, perpetual calendar and tourbillon with a stop-seconds mechanism in 18-carat HONEYGOLD. This version is a limited edition of 50 pieces. The semi-transparent dial is made of sapphire crystal, with an outsize date, moon-phase display, weekday display and day/night indicator. Case diameter is 41.5 mm and height is 14.6 mm, with a see-through back and a water-resistance rating of 30 metres. Manual-winding calibre L952.4 has a 50-hour power reserve. The dark brown alligator leather strap has a folding clasp. With 684 parts, the movement beats at 18,000 semi-oscillations per hour.