The new A. Lange & Söhne Lange 1 Perpetual Calendar is totally focused on the eponymous complication. Its integration into the prominent dial layout of the Lange was made possible thanks to a peripheral month ring created especially for this design. The new timepiece comes in a 41.9 mm 18K pink gold case with a grey silver dial or in a limited edition of 150 watches in 18K white gold with a solid pink gold dial. The latter material combination has been presented by A. Lange & Söhne initially in 2019, in the Datograph Perpetual Tourbillon, also a limited edition model. Color-coordinated hands and appliques in pink gold or rhodium gold round off the harmonious design. In the pink gold version, the hands are also luminous, as are the square hour markers of the minute scale. The white gold version has a dark brown leather strap, the pink gold model comes with a red-brown leather strap. The moon phase display with an integrated day/night indicator is a further special feature.

Exactly 20 years ago, A. Lange & Söhne presented the Langematik Perpetual, its first wristwatch with a perpetual calendar. It was followed by seven further models, mostly in combination with other complications such as a chronograph, a tourbillon, or both. Apart from the classic principle with calendar displays controlled by a 48-step cam, the Lange 1 Tourbillon Perpetual Calendar introduced in 2012 already took a different approach that has now been adopted by the new model. To integrate the calendar ensemble into the exceptional off-centered dial architecture of the Lange 1 without compromising the harmonious balance of the displays, the month indication was implemented with a ring at the periphery of the dial that advances once a month. This design replaces the classic control principle with a 48-step cam. The innovation challenged the ingenuity of Lange’s engineers because advancing the ring at the end of the month requires considerably more power than traditional solutions.

The ring-shaped month display is complemented with the Lange outsize date, a retrograde day-of-week display, and a leap-year indication. The instantaneously advancing calendar displays are always crisply legible. They can be advanced collectively or individually with correctors. Once properly set, the mechanism is programmed to reliably indicate each month change until the year 2100.

The perpetual calendar is the central complication of the A. Lange & Söhne Lange 1 Perpetual Calendar, but not the only one. The watch additionally features a moon-phase display with an integrated day/night indicator. The combination of the moon-phase display with a day/night indicator has two layers. It consists of a solid-gold celestial disc with a blue gradation. It completes one full revolution about its own axis every 24 hours. Against this background, the moon —either in white or pink gold— performs its synodic orbit in 29 days, 12 hours, 44 minutes, and three seconds with such precision that it takes 122.6 years before a correction by one day is needed. With the 2016 debut of the combined display in the Lange 1 Moon Phase, the moon appears on a monochrome light blue canopy during the day and on a dark blue starry sky at night.

Powering the Lange 1 Perpetual Calendar is the automatic movement L021.3. Based on the calibre L021.1 of the Lange 1 Daymatic and has been endowed with a newly developed winding mechanism. Its technical features include a unidirectional winding rotor in 21K gold with an additional centrifugal mass in platinum, a power reserve of 50 hours, and a cam-poised balance that runs with a frequency of 21,600 vph.

Many of Lange’s quality hallmarks can be admired through the sapphire crystal case back: the plates and bridges made of untreated German silver and decorated with Glashütte ribbing, five gold chatons secured with thermally blued steel screws, and the hand-engraved balance cock with the superposed whiplash spring used for beat adjustments. As always, the parts of the movement, which are assembled twice, are manually finished to the strictest Lange standards. The materials, the architecture, and the artisanal finissage confirm that in terms of unique design and mechanical perfection, this watch is perpetual in every respect.

Sticker Price $104,500 USD in pink gold and $116,000 USD in white gold. For more info on A. Lange & Söhne click here.