Following the directions set out by the first diver’s watch created by Richard Mille, the RM 025, the RM 028 utilizes a number of key elements that demarcate the theme of diving within the collection. Cased in a slightly smaller diameter of 47mm, this new creation has all the hallmarks of the uncompromising character that the watches created by Richard Mille possess. Its exceptional tripartite case with unidirectional lunette and water resistance to 300 meters follows ISO diver’s watch norm 6425, creating a perfect environment to house the skeletonized movement with variable rotor geometry, a Richard Mille exclusive.
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, curved, tripartite case design using torque screws that can be individually and precisely tensioned with high accuracy around the exterior circumference of the case.
This is complemented by a screwed crown construction. The lugs of all versions are in titanium, with screws to attach the rubber diving strap for maximum security.
DATE DISPLAY Semi-instantaneous, placed in a vertical aperture in the numeral 7. The calendar disc of sapphire crystal is treated with non-reflective coating on both sides.
POWER RESERVE Circa 55 hours.
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.
CALIBER RMAS7 Skeletonized automatic winding movement with hours, minutes, central seconds, date and adjustable rotor geometry.
BOTTOM PLATE, BRIDGES AND BALANCE COCK MADE OF TITANIUM
The manufacture of these components in grade 2 titanium with black PVD coating allows the whole assembly to be given great rigidity, as well as precise surface flatness which is essential for the perfect functioning of the gear train.
DOUBLE BARREL SYSTEM
The double barrel system helps to improve the stability of torque over a longer period. This is achieved by using more turns, thereby reducing pressure and friction on the teeth, the bearings and the pivots, resulting in improved long-term performance.
INTERIOR FLANGE (upper and lower)
In carbon fiber, with index points filled with approved luminous material.
- Dimensions of movement: 30.25 x 28.45 mm
- Thickness: 4.33 mm
- Number of jewels: 32
- Barrel arbor – in AP 20 steel
- Balance: GLUCYDUR, 3 arms, inertia moment 4.8 mg.cm2, angle of lift 53o
- Frequency: 28,800 vph (4 Hz)
- Balance spring: ELINVAR NIVAROX
- Shock protection: INCABLOC 908.22.211.100 (transparent)
- Escapement wheel jewels: Rubifix (transparent) - Stem with three positions: manual winding, time setting, date adjustment
- Baseplate and bridges in hand-ground titanium, wet sandblasted, PVD or Titalyt® treated
- Burnished pivots
- Diamond polished sinks on the bridge side
- Pinions with undercuts
- Sandblasted and rhodium-plated, beveled wheels
- Sapphire blasted surfaces
- Anglage and polishing by hand
- Screw slot and screws beveled and polished
with rounded and polished tip
47.00 mm x 14.60 mm.