LANGE 1 TIME ZONE

The LANGE 1 TIME ZONE occupies a special position between world-time and GMT watches. With pushbutton ease, the time in any time zone can be transferred to a separate subsidiary dial. Home time and a conveniently selectable zone time are both legible at a glance. Fifteen years after its launch, the watch has now received a new movement, ring-shaped day/night indicators and an additional daylight saving time indication.

 

LANGE 1 TIME ZONE

 

In our globalised world, watches with several time zones rank among the most useful complications. GMT timepieces indicate the time in a further zone which needs to be remembered. A world-time watch simultaneously provides the time in several zones, which is not always easy to grasp. The LANGE 1 TIME ZONE offers the best of both worlds: It combines a clearly readable double time indication with a pusher-actuated city ring that allows a freely selectable second time zone to be comfortably set. Both time zones are endowed with a central day/night indicator that, in conjunction with the hour hands, is intuitively legible. A special clou: The time of the second time zone can be transferred to the main dial. This is made possible with an elaborate mechanism.

 

Technical innovations

In 2020, the LANGE 1 TIME ZONE was fitted with an extensively reworked manufacture calibre. The key technical innovations include two ring-shaped day/night indicators for home and zone time. They replace the peripherally arranged, rotatable arrow appliques of the first generation and are legible in conjunction with the hour hands from the centre. If the hour hand is positioned in the blue semicircle, it is nighttime (6 PM to 6 AM); if not, it is daytime (6 AM to 6 PM). Thanks to the new design, the number of hands has been reduced from nine to seven. This creates a wellorganised face. The daylight saving time indication is also new. It is located in the aperture of the arrow applique on the zone-time dial. If the aperture is red, the respective city has a daylight savings time regime. If it remains white, standard time applies there throughout the year. Should daylight saving time apply at home but not in the selected zone, one hour must be subtracted from the displayed zone time.

 

LANGE 1 TIME ZONE
Calibre L141.1 of the new LANGE 1 TIME ZONE. Easily recognisable on the dial side: the discs of the new day/night indicators and the red-white display segment of the daylight saving time indication. Movement side (left): the hand-engraved intermediate-wheel cock. The wheel train above the three-quarter plate transfers the minute indication from home to zone time

 

The newly developed L141.1 manufacture calibre delivers a power reserve of 72 hours – contrary to the predecessor model with only one mainspring barrel. A corresponding inscription on the dial replaces the former TWIN MAINSPRING BARREL legend. Further technical assets include a classic screw balance and a freely oscillating balance spring crafted in-house which beats with a frequency of 21,600 semi-oscillations per hour (3 hertz).

 

Ring-shaped day/night indicators

The driving wheel of the day/night indicator for home time is located at the top left of the dial side. It is connected with the home-time hour wheel. With a transmission ratio of 2:1, it converts the 12-hour rotation of the hour wheel into a 24-hour rotation of the day/night indicator disc. The driving wheel of the day/night indicator for zone time is located at the bottom right. It is connected with the zone-time hour wheel and also causes the day/night indicator disc for zone time to rotate once every 24 hours as well. Reading the time is now very easy. If the hour hand is positioned in the range of the blue semicircle of the respective day/night indicator disc, it is between 6 PM and 6 AM (nighttime). The remaining range applies to the time from 6 AM to 6 PM (daytime).

 

Technical drawing of the front view of the manufacture calibre L141.1 which drives the LANGE 1 TIME ZONE.
With the new manufacture calibre L141.1, all models of the LANGE 1 watch family that were originally based on the calibre L901 are now endowed with new movements. The most recent one reflects the experience accrued with the development of 65 calibres so far. In comparison with the predecessor model, the 72-hour power reserve is achieved with only one spring barrel. Further technical details include a classic screw balance and a freely oscillating balance spring crafted in-house and calibrated for a frequency of 21,600 semi-oscillations per hour.

 

Daylight saving time indication

Concurrently, a lever samples the inner contour of the city ring. It transfers its motion to the redwhite display segment. If the lever descends into a recess of the contour, the white part of the display segment is pivoted into the aperture of the arrow applique. White signifies that the reference city uses standard time throughout the year. If the lever does not descend, the aperture of the arrow applique shows red. In this case, daylight saving time applies in the reference city.

 

 

Using the daylight saving time indication

The daylight saving time indication shows whether the location selected via the city ring for the zone time has a daylight saving time regulation. However, you also need to know whether daylight saving time currently applies there. For example, the exact start and end of daylight saving time is regulated differently at different locations. It should also be noted that the summer time arrangements in cities in the southern hemisphere apply in the winter months and not in the summer months.

Usually, the owner will set daylight saving time on the main dial by advancing the time by one hour. In this way, the zone time in the smaller of the two time displays is also moved forward by one hour. With the return to standard time in autumn, the owner will turn back the watch by one hour.

 

Three simple, generally valid rules for reading the zone time can be derived from this:

 

  • If the home time is set to daylight saving time, but there is no daylight saving time at the zone time location at this time, one hour must be subtracted from the displayed zone time (- 1h).
  • If the home time is set to standard time, but daylight saving time is in effect at the zone time location at that time, one hour must be added to the displayed zone time (+ 1h).
  • If daylight saving time or standard time prevails at both locations simultaneously, the zone time displayed on the watch is correct.

The time-zone mechanism

In the normal mode, the wheel trains for zone time and the city ring are separated from one another. While the wheel train continues to move, the city ring remains secured in the selected position. The situation changes as soon as a new zone time is set. Now, the city ring, the zonetime hour hand, and its day/night indicator must be advanced simultaneously. This task is handled by a complicated correction mechanism with 67 parts.

 

Synchronisation of the time indications

The time in the second zone can be transferred from the small to the large dial. This swaps the previous zone time with the new home time and vice-versa. Then, the two time indications have to be resynchronised.

Technical drawing of the front view of the LANGE 1 TIME ZONE which was presented in June 2020.
The LANGE 1 TIME ZONE indicates the time at home and in another time zone at a glance. Fifteen years after its launch, it has now been endowed with a new manufacture calibre. Ring-shaped day/night indicators assure good legibility and the new daylight saving time indication is a useful addition.

 

In a first step, the city ring is advanced with the pusher at 8 o’clock until the arrow applique lines up with the reference city for home time. It is important to keep the pusher pressed after it was last actuated. This blocks the hour hand and the day/night indicator on the subsidiary dial for the second time zone. While keeping the pusher pressed, pulling the crown brings the hands and the day/night indicator of the main dial to the same setting as on the subsidiary dial by turning the crown clockwise. As soon as the pusher is released, all time indications and the day/night indicators are synchronised. Now, the crown can be used to accurately set the new home time before selecting a new second zone time with the pusher and the city ring.

 

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About A. Lange & Söhne

Dresden watchmaker Ferdinand Adolph Lange laid the cornerstone of Saxony’s precision watchmaking industry when he established his manufactory in 1845. His precious pocket watches remain highly coveted among collectors all over the world. The company was expropriated after World War II, and the name A. Lange & Söhne nearly vanished. In 1990, Ferdinand Adolph Lange’s great-grandson Walter Lange had the courage to relaunch the brand. Today, Lange crafts only a few thousand wristwatches per year, predominantly in gold or platinum. They are endowed exclusively with proprietary movements that are lavishly decorated by hand and assembled twice. With 65 manufacture calibres developed since 1990, A. Lange & Söhne has secured a top-tier position in the world of watchmaking. Brand icons such as the LANGE 1 with the first outsize date in a regularly produced wristwatch, and the ZEITWERK with its precisely jumping numerals display, rank among the company’s greatest successes. Exceptional complications such as the ZEITWERK MINUTE REPEATER, the TRIPLE SPLIT, and the so far most complicated model, the GRAND COMPLICATION presented in 2013 in a six-watch limited edition, reflect the manufactory’s determination to achieve ever new pinnacles in its tradition-steeped horological artistry. Launched in 2019, the sporty-elegant ODYSSEUS marks the beginning of a new chapter for A. Lange & Söhne.

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