Tradition Chronographe Indépendant 7077
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A symmetrical design with an exclusive heart accentuated by "Breguet Blue"
In line with Abraham-Louis Breguet's vision of making technical innovation accessible—a philosophy that has driven the Maison for over two centuries—the Tradition Chronographe Indépendant 7077 emphasizes precise short-time measurement with an intense hue: the "Breguet Blue."
Introduced into the Tradition collection, which draws inspiration from the renowned subscription and tact watches developed by the Maison's founder, the "Breguet Blue" now graces the face of the Tradition Chronographe Indépendant 7077, enhancing its modern aesthetic. This colour introduces new contrasts that intensify readability and highlight the technical architecture, offering an unobstructed view of the dual balance wheels in action.
Tradition Chronographe Indépendant 7077: the balance of duality
With its impressive geometric appearance, particularly the symmetrical design of its displays and dual balance wheels, this reference also boasts innovative mechanics, conceived and patented by Breguet, within the manual-winding calibre 580DR.
Tradition Chronographe Indépendant 7077
A symmetry accented by "Breguet blue"
Despite its seemingly complex appearance, the symmetrical design of this 44mm diameter and 14.1mm thick watch offers remarkably efficient readability with perfectly arranged elements.
At 12 o'clock, the hours and minutes are indicated by two rhodium-plated Breguet open-tipped hands on a "Breguet Blue" gold dial, hand-engraved with a Clous de Paris pattern, surrounded by white Roman numerals.
Two overlapping arcs are present on this dial: on the left, the chronograph's 20-minute counter, driven by the central chronograph hand; and on the right, the power reserve indicator.
Two independent gear trains
In a conventional chronograph, measuring elapsed time provides immediate visualization of the desired function, however its implementation poses an additional mechanical challenge, as activating this function can disrupt the main gear trains. This issue is absent in Breguet's Tradition Chronographe Indépendant 7077, due to the two entirely separate gear trains within the manual-winding calibre 580DR.
The first gear train, responsible for hours and minutes, is regulated by a balance wheel oscillating at a gentle frequency of 3Hz, visible on the right side of the dial beneath the power reserve indicator, which offers a 55-hour reserve. The second gear train operates at a high frequency of 5Hz, enhancing stability and ensuring precise chronograph readings. With this frequency, the chronograph achieves exceptional precision, allowing timing to the tenth of a second, ensuring high reliability for short-time measurements—a testament to the ongoing advancements pushing the boundaries of mechanical timekeeping precision.
Two distinct energy sources
Typically, a second gear train necessitates an additional barrel, requiring more space and the winding of both the chronograph and timekeeping barrels. In the Tradition Chronographe Indépendant 7077, Breguet employs a single barrel with a spring perfectly suited for the chronograph function.
The energy required for the chronograph is supplied when the reset function is activated and is stored in a flexed blade spring. This reserve lasts up to 20 minutes, ideal for short-time measurements, and ensures instant chronograph start-up, as the available energy is always at its peak. A non-concentric gear is paired with the blade spring to smooth the torque, achieving constant amplitude and chronograph operation. This blade spring-gear system is patented by Breguet.
Detailed controls
The chronograph function of this white gold-cased Tradition model is operated by two screw-down pushers, preventing unintended activation. Unlike other chronographs, the pusher at 4 o'clock on the fluted case band starts the timing, while the other stops and resets it.
Activating the reset function flexes and arms the blade spring, preparing the chronograph for a new measurement. The titanium balance wheel is equipped with two stop systems: the first, operated by a cam, releases the balance wheel at the chronograph's start and holds it at stop; the second halts the balance wheel when insufficient energy remains for complete operation. Thus, the balance wheel is always in the optimal position, achieving its amplitude instantly. This innovative mechanism is patented.
