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.
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.
The movement is your hand-wound Caliber L043.1, that has 415 components and steps 33.6 mm in diameter. Its equilibrium oscillates at a leisurely frequency of 18,000 vph. (To see our test of the first Lange Zeitwerk, click here.) This watch is significantly more than a traditional perpetual calendar. Turn it over and you’ll see among the very complicated and unconventional moon-phase screens ever made. Surrounding the earth is a disc decorated with 2,116 stars. (Their positions don’t correspond to those of actual stars; Lange calls the arrangement a “dream sky.”) A third disk, for showing the stage of the moon, lies beneath an aperture in the star disk.The earth disk rotates counterclockwise after every 24 hours; you can see the period anywhere in the world by referring to the 24 hour markers on the ring surrounding the display. Since the moon orbits, it waxes and wanes. The watch’s equilibrium, visible throughout the caseback, signifies the sun: when the moon is between the ground and the balance, the moon disk is all blue, representing the new moon. When it’s on the other side of the planet, it is all gold, representing the entire moon. The moon screen is so true that it’ll be 1,058 years before it has to be corrected by a single day.
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 watch 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