As announced by A. Lange & Söhne at SIHH 2019, a new Lange 1 will be announced every month leading to the Anniversary in October. For April, the new watch is the Lange 1 Tourbillon Perpetual Calendar 25th Anniversary. Here are the Press Release details.
Presentation of the fourth model of the anniversary collection
In an elegant and subtle manner, the Tourbillon Perpetual Calendar integrates a perpetual calendar and a tourbillon in the inimitable design of the Lange 1. As a tribute to its anniversary, A. Lange & Söhne introduces the most complicated model of this watch family in a 25-piece limited white-gold edition with blued-steel hands.
Required reading:
The base model is the Tourbillon Perpetual Calendar released in 2012.
A rotating peripheral ring that indicates the month was devised to integrate all calendar indications in the dial architecture of the Lange 1. The underside of the construction features a circumferential contour with wave-shaped recesses. A spring-loaded sampler lever glides along this contour and is deflected by a magnitude that corresponds to the depth of the respective recess. The more it is deflected, the shorter the month. All displays switch instantaneously.
A retrograde day-of-week display takes the place of a power-reserve indicator. The leap year is indicated in a small aperture at 6 o’clock. And the moon-phase display, calculated to an accuracy of 122.6 years, includes a hand-engraved lunar disc in white gold that is visible through an aperture on the seconds sub-dial. Thanks to the intuitive arrangement of the simultaneously switching calendar indications, a single glance delivers all of the information at once.
The argenté-coloured dial of the “25th Anniversary” edition has discreetly nuanced shades of blue. The palette ranges from thermally blued-steel hands to all inscriptions, including the numerals of the outsize date and the alligator leather strap.
Only a modest epigraph at 12 o’clock reveals a further function. This is because the 69-part tourbillon with the patented stop-seconds mechanism is visible only from the movement side. There, the filigreed cage rotates about its axis once a minute to eliminate the influence of gravity on Lange’s proprietary cam-poised balance. The stop-seconds mechanism makes it possible to instantly stop the tourbillon cage with the balance at any time by pulling the crown so the watch can be set with one-second accuracy.
The tourbillon cock is graced with a blue engraving shaped like the Lange outsize date with the number 25. The 25 not only refers to the birthday but also to a special detail of the launch. It took place on 24 October 1994. On this day, the date displays of the debut watches were set to the 25th so they would be current when showcased in the following day’s newspapers.
The high winding efficiency of the automatic calibre L082.1 is attained with a heavy central rotor featuring an outer centrifugal mass in platinum; its middle segment with the embossed A. Lange & Söhne signature is made of 21-carat gold. The Lange-typical quality hallmarks of the 624-part movement include the black polish on the upper side of the tourbillon cage and a diamond endstone bearing that holds the tourbillon.
Lange 1 Tourbillon Perpetual Calendar “25th Anniversary”
Ref. 720.066
Movement
Lange manufacture calibre L082.1; self-winding, crafted to the most exacting Lange quality standards, decorated and assembled by hand; precision-adjusted in five positions; plates and bridges made of untreated German silver; central element of the unidirectional winding rotor in 21-carat gold, platinum centrifugal mass; intermediate-wheel and tourbillon cocks engraved by hand and filled with blue, engraving of the Lange outsize date on the tourbillon cock
Movement parts 624 No. of jewels 76, including one diamond endstone Screwed gold chatons 6
Escapement Lever escapement
Oscillation system
Shock-resistant cam-poised balance; balance spring manufactured in-house, frequency 21,600 semi-oscillations per hour
Power reserve 50 hours when fully wound
Functions Time indicated in hours, minutes and seconds, tourbillon with patented stop seconds; perpetual calendar with outsize date, day of week, month, and leap year; day/night indicator; moonphase display
Operating elements
Crown for winding the watch and setting the time; recessed push pieces for advancing all calendar displays or separately correcting the month, day of week, and moon phase
Case dimensions
Diameter: 41.9 millimetres; height: 12.2 millimetres
Movement dimensions
Diameter: 34.1 millimetres; height: 7.8 millimetres Glass and caseback Sapphire crystal (Mohs hardness 9)
Case White gold
Dial Solid silver, argenté, English inscriptions
Hands Blued steel
Strap Hand-stitched alligator leather, blue with grey contrast seam
Buckle Deployant buckle in white gold Limited edition 25 watches, engraved 01/25 … 25/25
