GCA3900
To make the GCA3900’s jumping hours disc advance instantaneously, the Maison’s engineers had to generate up to 70,000 times the force of a conventional movement.
A masterpiece of engineering
In developing the Swiss Manufacture GCA3900 Calibre Jumping Hours, the Maison’s engineers faced significant physical challenges: the jumping hours disc, 25 times heavier than a conventional hour hand, must advance instantaneously once every hour. According to Newton’s second law, this sudden acceleration demands a force orders of magnitude greater, up to 70,000 times, than that required in a traditional three-hand movement.
Features
TYPE
Anti-clockwise jumping hour instant with concentric minutes.
DIMENSIONS
28.00mm diameter, 6.15mm total thickness.
NUMBER OF COMPONENTS
265 pieces.
FREQUENCY
28’800 A/h – 4Hz
FINISHING
Bridges finely decorated with colimaçon, côtes de Genève and perlage finishes. Rhodium-plated module wheels.
OSCILLATING WEIGHT
Golden unidirectional central oscillating weight. Two layers of finishings: sandblasted base, colimaçon and soleil brushed top with the Gerald Charles “honeycomb” motif.
SHOCK RESISTANCE
5G shock resistance, tested with 5 axes robotic arm. Incabloc anti-shock system.
The complication
At 12 o’clock, the dial reveals a 12-hour disc with a jumping hours complication and time is read using this disc and a blued central hand. It required 80 additional components beyond a standard time-only movement to achieve this complication.
A movement with a thickness of 6.15mm boasting a great shock resistance.
Wheels are rhodium-plated, a quiet but powerful symbol of Gerald Charles’ obsession with beauty.
Bridges are decorated with colimaçon, côtes de Genève and perlage finishes.
A golden unidirectional central oscillating weight completes the movement.
It powers the following models
Caliber of the Maestro GC39 25° Anniversary Edition
