CREATED FOR EXTREME CONDITIONS
RM 025 TOURBILLON CHRONOGRAPH DIVER'S WATCH
CARBON NANOFIBRE BASEPLATE
This is an isotropic composite material created from carbon nanofibres moulded under a pressure of 7,500 N/cm2 at a temperature of 2,000˚C, resulting in a material with high mechanical, physical and chemical stability in all directions.
The ribbed perimeter of the movement’s baseplate ensures optimal rigidity of the baseplate and bridges.
Carbon nanofibre composites such as this are amorphous, chemically neutral and dimensionally constant within a very wide range of operating temperatures, including those outside of normal experience. This stability ensures the greatest possible integrity of the movement’s going train under all conditions.
In a manner similar to a car’s gearbox, the function indicator makes it possible to identify the winding, neutral and hand-setting positions as the crown is pulled out. The active position is indicated via a hand at 4 o’clock that indicates the function as follows: W (Winding) – N (Neutral) – H (Hands).
This indicator supplies information about the mainspring’s tension, thus permitting an optimisation of the movement’s chronometric functioning. Below 5.3 N.mm, the spring is considered too slack, while above 6.5 N.mm, excess tension in the spring can adversely affect the mechanism’s operation, or actually endanger it.
The power-reserve indicator shows the number of hours of energy left in the mainspring before the watch must be wound again.
Movement diameter: 38.95 mm
Thickness: 8.12 mm
Tourbillon diameter: 12.30 mm
Number of jewels: 30, set in white gold chatons
Balance: Glucydur®, 2 arms, 4 setting screws, moment of inertia 10 mg•cm2, angle of lift 53°
Frequency: 21,600 vph (3 Hz)
Balance spring: elinvar by Nivarox®
Shock protection: KIF Elastor KE 160 B28
Barrel shaft: nickel-free Chronifer® (DIN x 46 Cr 13 + S) with the following characteristics: stainless – antimagnetic – suitable for tempering
The watch is water resistant to 30 atmospheres (300 metres) per ISO 6425 diver’s watch norms. This is achieved within a unique, curved, tripartite case design using torque screws that can be individually and precisely tensioned with great accuracy around the exterior circumference of the case. This is complemented by a screw-lock crown construction. The lugs of all versions are made of grade 5 titanium, with screws to attach the rubber diving strap for maximum security.
This component is constructed of three layers, connected using 22 screws, and turns unidirectionally per ISO 6425 norms to avoid timing miscalculations. The use of an additional screwed system attaching the bezel to the watchcase makes it absolutely stable, as well as impossible to inadvertently dislocate or loosen. In addition, the use of screws makes possible perfect adjustment since the bezel is not tensioned into position.
For clearer visibility under murky conditions, starting at 12 o’clock, the five-minute markers of the first quarter are highlighted in red.