The extreme conditions of submarine use called for the design and construction of an extreme technical product. An instrument involved in actually protecting the life of its user. The technology here demanded high performance, of course, with the added parameters of safety, reliability, robustness and ergonomic function.
300 METER WATER RESISTANT CASE. The watch is water resistant to 30 atmospheres (300 meters) following ISO 6425 diver’s watch norms. This is achieved with a unique tripartite case design complemented by the additional integration of the lugs into the case’s torque screw system, as well as the torque limiting crown and a new design
of watertight pushers. The lugs of all versions (18-carat red and white gold or titanium) are in 18-carat red gold, with screws for the attachment of the rubber diving strap.
TORQUE INDICATOR Supplies information about the tension of the mainspring, and allows the optimization of the chronometer function of the movement. Below 53 dNmm, the spring is considered to be too slack, while above 65 dNmm, the excessive spring tension can adversely affect the mechanism’s operation, or else actually endanger it. These indications appear on the numerical zone to the right of the barrel.
BEZEL Built up of three layers connected with 22 screws, turning unidirectionally following 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 allow for 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 red.
FUNCTION INDICATOR In a manner similar to a car's gearbox, the function indicator allows one to see the winding, neutral and hand setting positions as the crown is pulled out. Each position is indicated via a hand at 4 o’clock displaying the following functions: W (Winding) – N (Neutral) – H (Hands).
CALIBER RM 025 Manual winding tourbillon movement with hours, minutes, chronograph, power reserve, torque indicator, function indicator.
BALANCE WHEEL WITH VARIABLE INERTIA
This type of balance wheel, which represents the ultimate in innovation, guarantees greater reliability when subjected to shock and also during assembly and dismantling of the movement, thus achieving better chronometric results over time. The index is eliminated, thereby allowing a more precise and repeatable adjustment.
BARREL PAWL WITH PROGRESSIVE RECOIL
This device permits an appreciable winding gain (circa 20 %), especially during the start of winding. It also aids in the even distribution of the mainspring’s internal tension.
In order to improve performance, lengthy research was carried out to determine a special curve of the hairspring, aimed at reducing the shifting of the centre of gravity during functioning.
New in-line escapement design, aimed at reducing friction.
CLOSURE OF THE BARREL COVER USING EXCENTRIC SCREWS
This development is again part of the intention to make servicing easy, logical, and of a very high mechanical standard.
WHEEL BASED TIME SETTING SYSTEM (back of the movement)
Provides smooth time setting functions through the elimination of engaging friction by replacing it with rolling friction.
• Anglage and polishing by hand
- Locking sections hand polished
- Sapphire blasted milled sections
- Lapped and polished contact points • Burnished pivots
- Sapphire blasted surfaces
- Anglage and polishing by hand
- Concave chamfering with a diamond tool
- Circular finished faces
- Gilded (before cutting the teeth)
- Minimal corrections applied to the wheels in order to preserve geometry and performance.
50.70 mm x 19.10 mm