With the unique combination of a jumping second, a constant-force escapement, a Zero-Reset mechanism, and a prominent regulator dial layout, the Richard Lange Jumping Seconds plays in a league of its own. The platinum model that had its debut last year is now followed by a second version in rose gold, also in a limited 100-watch edition.
The subdivision of an hour into 60 minutes of 60 seconds each dates back 1,000 years. Then, about 400 years ago, the first watch with a seconds hand appeared. It marked the beginning of a new and more precise standard in timekeeping.
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. That can be interpreted literally. In 60 steps per minute, the blued seconds hand advances along the upper and largest circle of the regulator dial. The cadence is defined by an ingenious 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 10 hours in advance.
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 watch to be conveniently and precisely synchronized with a time signal or a radio-controlled clock. An innovative multi-disc clutch reliably stabilizes the large seconds hand throughout the accelerating and braking phases to assure perfect one-second legibility of the time.