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ZERO-RESET MECHANISM

Starting to the second

The patented zero-reset

With the ZERO-RESET mechanism, the movement stops and the seconds hand jumps to zero when the crown is pulled. This allows the watch to be accurately synchronised.

The mechanism consists of a complex lever system that presses a zero-reset lever against a heart-shaped cam. The seconds hand is attached to the same arbor on which the heart cam rotates. When the heart cam is pivoted into its initial position by the zero-reset lever, this also causes the seconds hand to jump to zero. Pushing the crown home again instantly restarts the movement and with it the seconds hand.


In a modified, even more complex form, this mechanism can also be found in the 1815 TOURBILLON except that here, the tourbillon must be stopped instead of the balance.

Complications

Outsize date
Outsize date
The A. Lange & Söhne outsize date enables a date display with digits around three times as large as those in watches of comparable dimensions.
Chronograph
Chronograph
Chronographs and their manufacture movements have been flagship products of A. Lange & Söhne since 1999.
Calendar function
Calendar function
Lange models incorporate either annual calendars or perpetual calendars.
Moon-phase display
Moon-phase display
Most of our moon-phase displays reproduce the moon’s orbit with a precision of 99.998 per cent.
Power-reserve indicator
Power-reserve indicator
The UP/DOWN display reminds the owner to rewind the watch before it stops running.
Tourbillon watches
Tourbillon watches
The tourbillon improves the rate accuracy of a mechanical timepiece by overcoming the influence of gravity on the running of a watch.
Zero-reset mechanism
Zero-reset mechanism
With the ZERO-RESET mechanism, the movement stops and the seconds hand jumps to zero when the crown is pulled.
The fusée-and-chain transmission
The fusée-and-chain transmission
The fusée-and-chain transmission is one of the most effective complications when it comes to increasing the rate accuracy of a mechanical watch.
Constant-force escapement
Constant-force escapement
The purpose of a constant-force escapement in a mechanical watch is to provide the escapement with a consistent flow of power, regardless of whether the watch is fully wound or nearly unwound.
Striking mechanism
Striking mechanism
Watches with a minute repeater or other striking mechanisms make time audible. Given their horological intricacy, these models are among the most elaborate and rare timepieces in the realm of precision watchmaking.

Explore further

Tourbillon watches
Tourbillon watches
The tourbillon improves the rate accuracy of a mechanical timepiece by overcoming the influence of gravity on the running of a watch.
Jumping seconds mechanism
Jumping seconds mechanism
The mechanism of the jumping second assures unambiguous readings at any time, because it advances the large seconds hand by exactly 60 steps per minute.
Finishing and engraving
Finishing and engraving
The art of finishing movements ranks high in our manufacture. No matter whether large or infinitesimal, whether clearly visible or hidden, almost every part is decorated by hand. Different techniques are used: every component is assigned its own individual type of finish, the sum total a harmonious overall appearance.

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