A. Lange & Söhne Langematik Perpetual

The A. Lange & Söhne Langematik Perpetual, reference 310.026 E, has a perpetual calendar and an 18-carat white gold case. The calendar accounts for differing month lengths and leap-year deviations. The case measures 38.5 mm in diameter and 10.2 mm in height, has a see-through back and is rated to 30 metres. Self-winding calibre L922.1 comprises 478 parts. The movement has a 46-hour power reserve, runs at 21,600 semi-oscillations per hour and carries a ZERO-RESET mechanism. A black alligator leather strap has an 18-carat white gold pin buckle. The black dial carries outsize date, weekday, month, moon-phase and day/night displays.