100
Lederer
Inverto "Prototype 00"
A unique and ground breaking stainless steel central impulse chronometer prototype wristwatch
Estimate
CHF60,000–120,000
€65,900–132,000
$76,100–152,000
Live 9 May, 2 PM Switzerland Time
Manufacturer
Lederer
Year
2025
Movement No
Prototype 00
Model Name
Inverto "Prototype 00"
Material
Stainless steel
Calibre
Manual, cal 9019
Bracelet/Strap
Leather
Clasp/Buckle
Stainless steel Lederer pin buckle
Dimensions
39mm diameter
Signed
Case, dial, movement and buckle signed
Accessories
Accompanied by Letter from Bernhard Lederer explaining the genesis of the watch, sketches, fitted box and outer packaging
Full-Cataloguing
Good To Know:
- Central Impulse Escapement based on Breguet and Daniels research
- Unique prototype in a unique stainless steel case (Lederer has never made a steel case)
- Accompanied by Lederer's original sketches
Bernhard Lederer’s Inverto is, as its name implies, an “inverted” version of his Central Impulse Chronometer movement, whereby the movement takes centre stage rather than being hidden beneath the caseback. However, Lederer did not simply invert the movement to make it visible on the dial side; he completely re-engineered the geometry of the remontoire system.
Bernhard Lederer is a German-born, Swiss-based independent watchmaker and a member of the AHCI since 1985. For decades, he created highly complicated movements behind the scenes for major brands before stepping into the spotlight in 2020 with a project that had been in development for decades: the Central Impulse Chronometer.
Inspired by an approach similar to that of George Daniels, Bernhard Lederer installed two escape wheels at the end of two separate gear trains, each powered by its own barrel. To each of these independent gear trains, Lederer added a 10-second constant-force remontoire—a mechanism that rewinds a small spring every ten seconds, ensuring a steady and even delivery of power to the escapement.
The escapement components and their geometry have been optimised, paring down the weight of energy-intensive components and reducing the internal friction of the escapement to a minimum.
Even though centre stage is given to the movement, the caseback features an engraving representing the movement as well as a seconds hand. A watch of incredible technical complexity and importance, Lederer’s Central Impulse Chronometer rightly won the innovation prize in 2021 at the GPHG. The Inverto will be produced in about 15 pieces per year, the present example is the only functional prototype and the only example made in steel.
According to Lederer this prototype enabled him to validate proportions and test technical solutions.
- Central Impulse Escapement based on Breguet and Daniels research
- Unique prototype in a unique stainless steel case (Lederer has never made a steel case)
- Accompanied by Lederer's original sketches
Bernhard Lederer’s Inverto is, as its name implies, an “inverted” version of his Central Impulse Chronometer movement, whereby the movement takes centre stage rather than being hidden beneath the caseback. However, Lederer did not simply invert the movement to make it visible on the dial side; he completely re-engineered the geometry of the remontoire system.
Bernhard Lederer is a German-born, Swiss-based independent watchmaker and a member of the AHCI since 1985. For decades, he created highly complicated movements behind the scenes for major brands before stepping into the spotlight in 2020 with a project that had been in development for decades: the Central Impulse Chronometer.
Inspired by an approach similar to that of George Daniels, Bernhard Lederer installed two escape wheels at the end of two separate gear trains, each powered by its own barrel. To each of these independent gear trains, Lederer added a 10-second constant-force remontoire—a mechanism that rewinds a small spring every ten seconds, ensuring a steady and even delivery of power to the escapement.
The escapement components and their geometry have been optimised, paring down the weight of energy-intensive components and reducing the internal friction of the escapement to a minimum.
Even though centre stage is given to the movement, the caseback features an engraving representing the movement as well as a seconds hand. A watch of incredible technical complexity and importance, Lederer’s Central Impulse Chronometer rightly won the innovation prize in 2021 at the GPHG. The Inverto will be produced in about 15 pieces per year, the present example is the only functional prototype and the only example made in steel.
According to Lederer this prototype enabled him to validate proportions and test technical solutions.