The Richard Lange Jumping Seconds pays tribute to watches for scientific observation and puts the focus on the smallest of the three time measurement units, the seconds. This limited 100-watch edition features a unique combination of jumping second, constant-force escapement, zero-reset mechanism, and prominent regulator dial layout within its 39,9 mm pink gold case.
The dial side has many other treats for the onlooker, namely those linked into the perpetual calendar and the rattrapante chronograph. The former consists of 206 components, nearly a third of their 684 total element count of this L133.1 standard. Lange’s moon phase is “accurate to 122.6 years” — mind you, which “precision” means that it requires that much time to get the moon phase screen to be off with a comprehensive moment. This sort of arbitrary way is how the accuracy of moon phase displays in watches is usually ascertained, not that anybody actually 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 challenging complications out there. Some watchmakers I asked told me they find it even more challenging to perform than the usual sonnerie or moment repeater, and definitely a much bigger pain in the throat than a perpetual calendar (unless it’s instantaneous or further complex). The two laser sharp chronograph seconds hands break a hair’s width above one another in their reset position, with all the blue being the rattrapante hand, operated by the pusher in the 10 o’clock position of this circumstance.
In 60 steps per minute, the blued seconds hand advances along the upper and largest circle of the puristic regulator dial of the Richard Lange Jumping Seconds. The cadence is defined by a one-second constant-force escapement that serves two purposes. On the one hand, it delivers the switching impulse for the seconds jump, and, on the other, it assures constant power delivery for the entire power reserve of 42 hours. A small indication in the intersection of the three time circles tells the owner when to rewind the watch: it switches to red ten hours in advance.
Richard Lange Jumping Seconds © A. Lange & Söhne
The function of the constant-force escapement can be observed close up through the sapphire-crystal caseback. The aperture reveals how the remontoir spring of the constant-force escapement receives fresh energy from the mainspring barrel every second to power the escapement at the same rate. Just below it, under a transparent jewel bearing, there is a star connected to the fourth-wheel arbor that controls the jumping seconds sequence. The zero-reset mechanism is also easily visible. When the crown is pulled, it stops the cam-poised balance and instantly propels the seconds hand to the zero position. This allows the A Lange & Sohne Watches Replica Replica to be conveniently and precisely synchronised with a time signal or a radio-controlled clock. An innovative multi-disc clutch reliably stabilises the large seconds hand throughout the accelerating and braking phases to assure perfect one-second legibility of the time.
The timepiece is fitted with a reddish-brown hand-stitched alligator leather strap, equipped with a Lange prong buckle in pink gold.
The Lange manufacture calibre L094.1 can be seen through the sapphire-crystal caseback © A. Lange & Söhne