The silver jubilee celebrations continue at A. Lange & Söhne as the German maison unveils its most elaborate Lange 1 25th Anniversary edition yet -  the Lange 1 Tourbillon Perpetual Calendar. You may recall that every month since January this year, the brand has unveiled a new model to celebrate the 25th anniversary of the its most emblematic model, the Lange 1.

The new watch is unmistakably Lange 1 and it has the the same white gold-blued steel hands aesthetic seen on the previous models. It uses a white gold case that is 41.9 mm wide and 12.2 mm thick. There are recessed push pieces for advancing all calendar displays or separately correcting the month, day of week, and moon phase.

The calendar indications are spread out across the dial

The asymmetric dial layout of the Lange 1 translates well to display a perpetual calendar mechanism. The same arrangement was adopted for the Lange 1 Tourbillon Perpetual Calendar model that was first launched in 2012. The anniversary edition uses a silver dial (this being the silver jubilee, of course). 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. 

The automatic movement has a platinum rotor for better winding

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 moonphase 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 subdial. 

The 69-part tourbillon with the patented stop-seconds mechanism is visible only from the movement side, where the filigreed cage rotates about its axis once a minute. 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 25th anniversary engraving is seen on the balance cock

And like the previous anniversary models, 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 automatic calibre L082.1 features a rotor made of 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. The watch is priced at €321,100 (inclusive of VAT).