A. Lange & Söhne Langematik Perpetual

The A. Lange & Söhne Langematik Perpetual, reference 310.037 E, has a perpetual calendar and an 18-carat pink gold case. This version is a limited edition of 50 pieces. The case measures 38.5 mm in diameter and 10.2 mm high, has a see-through back and is water resistant to 30 metres. Self-winding calibre L922.1 comprises 478 parts and incorporates a ZERO-RESET mechanism. The movement runs at 21,600 semi-oscillations per hour and has a 46-hour power reserve. A pink-gold pin buckle secures the dark blue alligator leather strap. The blue dial is made of solid silver and carries an outsize date, moon-phase display, weekday display and day/night indicator.