Lederer Central Impulse Chronometer Pacific Green | LE25

2021 GPHG WINNER: Innovation Prize

The prize winning Central Impulse Chronometer is the first Chapter of the Masters of Escapements series from Bernhard Lederer. Inventing a new, reliable, energy-efficient, self-starting, timepiece-compatible and high-accuracy escapement is the pinnacle of watchmaking.

Expanding on the work of masters Louis Brequet and George Daniels, Lederer takes watchmaking to a premiere level of expertise with the Central Impulse Chronometer, shown here with a Pacific Green grey-green open dial in a 904L steel case. Similar to George Daniels' approach, Bernhard Lederer has installed the two escape wheels at the end of two separate gear trains, each with its own barrel. However, the escapement functionality and architecture have been redesigned to ensure optimal efficient impulses to the oscillator. Additionally, each set of escape wheels has been fitted with its own remontoir, a mechanism that rewinds a small spring every 10 seconds and thus ensures an even flow of power to the escapement.

A limited numbered edition of 25 pieces
Ref. CIC9012

The movement’s architecture and performance are matched by a refined execution and meticulous finishing down to the smallest detail. Openworked bridges, proprietary wheel spokes and three-dimensional construction all rely on a thorough set of skills and equipment in Bernhard Lederer's workshop. Entirely designed and crafted in-house, each movement goes through a painstaking process of finishing, including extensive hand bevelling, graining, frosting, engraving, satin-finishing and polishing. The long and linear polished bevels of the remontoir and anchor bridges are eye-catching. And the grain-like texture of the mainplate and barrels is equally challenging.

The Central Impulse Chronometer escapement is based on a pair of escape wheels that interact with a special titanium anchor of a unique shape and optimal geometry. The impulse positions, angles and contact timing are designed to dramatically lower friction and therefore increase longevity. The sounds of the double impulse, and the sound when liberating the remontoirs, working alternately, provide the Central Impulse Chronometer with a unique, complex acoustic signature. The energy to power the movement is transmitted from two barrels via two independent gear trains, each linked to a dedicated escape wheel. In addition, Bernhard Lederer has integrated a remontoir d'égalité into each of the two gear trains to accumulate a buffer stock of energy in a small spring close to the escapement. Each remontoir is recharged at 10-second intervals and ensures the energy delivered to the balance wheel varies very little. Furthermore, the two remontoirs operate alternately one after another, separated by 5-second intervals, so each one offsets variations in the other.


TECHNICAL SPECIFICATIONS
Calibre
- Mechanical hand-wound movement
- Double barrels, two independent gear trains, two constant-force remontoires, & a double wheel escapement with central impulses
- 39.3 mm diameter & 5.98 mm height
Components
210
Jewels
45 rubies
Features
- Hours
- Minutes
- Two small seconds hands at 8 o'clock and 11 o'clock
Frequency
21'600 VpH (3 Hz)
Power Reserve
38 hours
Water Resistance
3 atm
Case
- 904L stainless steel case
- Open case back with sapphire crystal featuring anti-reflective coating on both sides
Measurements
- 44 mm diameter
- 12.2 mm height
Dial
- Pacific Green on 904L version
- Guilloché (exclusive Lederer pattern) with two interlaced circles forming a figure eight opening.


Oster Jewelers is an Authorized Lederer Watch Retail Partner