Introduced in 2001, the A. Lange & Söhne LANGEMATIK PERPETUAL is the first self-winding mechanical wristwatch with a perpetual calendar, an outsize date, and a patented zero-reset mechanism that allows the calendar displays as well as the moon-phase indication to be advanced both individually and, with one single main push-piece, collectively.
All indications of its perpetual calendar – the date, the day of the week, the month, the 4-year/leap-year display, and the moon phase – can be advanced separately with individual push-pieces or collectively with one main push-piece.
Endowed with the iconic outsize date display, the perpetual calendar does not have to be corrected until 28 February 2100. And on that date, all it takes is a simple press of a push-piece recessed in the case.
Once correctly set, the extremely precise moon-phase display will move continuously for 122.6 years before the aggregate error relative to the synodic lunar orbit amounts to one full day. The small-seconds hand seems to float above the gold moon disc. It is linked with the extremely useful, patented zero-reset mechanism.
Made of solid silver, the dial features solid gold appliqués. The gold hands that display the hours and minutes are coated with a luminous material. The LANGEMATIK-PERPETUAL is available in 18-carat gold or platinum. It comes with a hand-stitched crocodile strap or, optionally, with the wave bracelet.
The LANGEMATIK-PERPETUAL Platinum model features a solid silver rhodium dial, and comes with a black crocodile strap (reference 310.025) or platinum bracelet (reference 310.225).
The LANGEMATIK-PERPETUAL yellow gold watch has a solid silver champagne dial. It is available with a brown crocodile strap (reference 310.021) or 18K yellow gold bracelet (reference 310.221).
Comprising 478 individual parts, the Calibre Lange L922.1 SAX-0-MAT is visible through the sapphire-crystal caseback.
The self-winding calibre is powered by a bidirectional winding three-quarter rotor crafted from 21-carat gold and platinum. The winding force is transmitted to the mainspring barrel by a wheel train with four ball bearings that eliminate friction almost completely. It can store enough energy for up to 46 hours of autonomy.
The three-quarter rotor exposes the precious going train, showcasing the shock-proofed screw balance with the Nivarox-1 balance spring, the hand-engraved balance cock, and the whiplash precision index adjuster which allows the rate of the watch to be fine-tuned without requiring the removal of the balance wheel.
The patented zero-reset mechanism greatly simplifies the synchronisation of the watch with a time signal.
The complicated perpetual calendar mechanism is mounted on the dial side of the Lange L922.1 SAX-0-MAT calibre. The movement has 43 jewels. All of its surfaces are lavishly decorated by hand. The edges of the movement parts are chamfered and polished. And after assembly, the movement is adjusted in five positions.
Model: A. Lange & Söhne LANGEMATIK PERPETUAL
- Reference 310.021: 18K yellow gold case, Solid silver champagne dial; Brown crocodile strap
- Reference 310.025: Platinum case; Solid silver rhodium dial; Black crocodile strap
- Reference 310.221: 18K yellow gold case and bracelet; Solid silver champagne dial
- Reference 310.225: Platinum case and bracelet; Solid silver rhodium dial
Calibre L922.1 SAX-0-MAT, self-winding, bidirectional rotor, perpetual calendar with moon-phase display and outsize date, patented automatic ZERO-RESET mechanism
18 Carat gold or platinum
Sapphire-crystal glass and caseback
Diameter: 38.5 mm
Height: 10.2 mm
Crocodile strap or precious metal bracelet
Image Credit: Lange Uhren GmbH