The dial facet has lots of other treats for the onlooker, namely people linked into the perpetual calendar and the rattrapante chronograph. The former is composed of 206 parts, nearly a third of their 684 total component count of the L133.1 caliber. Lange’s moon phase is “true to 122.6 years” — mind you, that “accuracy” means that it requires that much time to get the moon phase display to be off with a comprehensive moment. This form of arbitrary way is the way the precision of moon phase displays in watches is generally ascertained, not that anybody really cares about actual practicality beyond its own aesthetic and technology element.The rattrapante chronograph on the other hand is one of the most technically impressive and hard complications on the market. Some watchmakers I asked told me they find it even more challenging to do than the usual sonnerie or moment repeater, and definitely a much bigger pain in the neck than a perpetual calendar (unless it’s instantaneous and/or further complicated). The two laser sharp chronograph seconds hands rest a hair’s width above one another in their own reset place, with all the blue being the rattrapante hand, operated by the pusher in the 10 o’clock position of the case.
Dresden and Florence are not just twinned since 1978 but are also related by parallels in terms of architecture, living traditions and the passion for craftsmanship. That is why A. Lange & Söhne has chosen Florence to be the city in which the new 1815 Rattrapante Perpetual Calendar Handwerskunst should be revealed. As part of the presentation, the guests explored the city’s pulsating cultural scene which brings together tradition, inspiration and craftsmanship. Artisans, designers and photographers offered exclusive insights into old techniques and showed their working spaces.
The big-date screen, which is patented, functions by means of a “ones” ring bearing the digits 0 through 9 plus a “tens” cross with the digits 1 through 3 and a sterile field. A special challenge for the engineers would be to make sure that the calendar switched correctly at the endings of months with 31 days. For those months, the “ones” ring needs to stay motionless during the night preceding the first of the new month, while the “tens of thousands” cross pivots through 90 degrees to bring its clean section into perspective. Lange & Söhne introduced its first self-winding watch, the Langematik, three years after it established the Lange 1. To increase the motion’s winding efficiency, the solid gold strand from the Langematik is equipped with an outer platinum segment. A reverser mechanism allows the rotor to convey energy into the mainspring in both directions of rotation. To minimize friction, Lange’s watchmakers added three micro ball bearings into the reduction gearing.