- Size
- 49.90 × 42.70 × 13.05 mm
- Edition
- Not limited
Overview
The original white configuration
The RM 055 Bubba Watson was introduced in 2012 as a non-tourbillon successor to the RM 038 Bubba Watson of 2011. Its case combines two materials: the bezel and back bezel in ATZ white ceramic, and the case middle in grade 5 titanium encased in white rubber injected at high pressure around the titanium components, which Richard Mille specifies both to insulate the movement from vibration and to condition the contact surface against the wrist.
ATZ is an aluminium-oxide ceramic. Richard Mille rates it at 1,400 Vickers and states that its colour is unchangeable. The curved bezel profile and its satin finish are produced by extended machining with diamond tools.
Key details
Bezel and back bezelATZ white ceramic
MovementCalibre RMUL2, manual winding, skeletonised
Introduced2012
Design and engineering
- Calibre RMUL2A manual winding skeletonised movement indicating hours, minutes and seconds. The baseplate and bridges are grade 5 titanium, PVD- and Titalyt®-treated, a combination Richard Mille specifies for rigidity and for the surface flatness the going train requires.
- Shock resistanceRichard Mille states the calibre withstands accelerations of over 500 g. The skeletonised baseplate and bridges were subjected to validation testing to establish their resistance limits before the design was fixed.
- Free-sprung variable-inertia balanceThe regulator index is eliminated. Rate adjustment is made by four small weights mounted directly on the balance, which Richard Mille specifies for repeatability of setting and for reliability through shock, assembly and disassembly.
- Double-barrel systemStored energy is distributed across two winding barrels rather than one. This increases the number of barrel rotations and reduces pressure on teeth, bearings and pivots, and supports the circa 55-hour power reserve.
- ATZ bezelThe ceramic is produced from tubes of aluminium oxide powder injected at a pressure of nearly 2,000 bar, a process Richard Mille states increases rigidity by 20 to 30% and reduces porosity to a minimum. Machining the curved bezel profile requires diamond tooling. Richard Mille places ATZ among the hardest materials after diamond.
- Rubberised titanium casebandWhite rubber is injected at high pressure around the grade 5 titanium case middle and back bezel, forming the protective outer surface.
Specifications
Technical specifications
| Reference | RM 055 |
|---|---|
| Calibre | RMUL2, manual winding, skeletonised |
| Functions | Hours, minutes, seconds |
| Power reserve | Circa 55 hours |
| Frequency | 28,800 vph (4 Hz) |
| Jewels | 24 |
| Baseplate and bridges | Grade 5 titanium, PVD and Titalyt® treated |
| Balance | Free-sprung, variable inertia, 4 adjustable weights |
| Barrel | Double barrel |
| Shock resistance | Over 500 g |
| Case dimensions | 49.90 × 42.70 × 13.05 mm |
| Case assembly | 20 grade 5 titanium spline screws, 316L washers |
| Bezel and back bezel | ATZ white ceramic, 1,400 Vickers |
| Case middle | Grade 5 titanium, white rubber coating |
| Crown | Grade 5 titanium with Alcryn collar |
| Crystal | Sapphire, anti-glare treated both sides |
| Water resistance | 30 m |
| Strap | White rubber |
| Edition | Not limited |
| Introduced | 2012 |
Buying with HYPA
Purchase with confidence
- Manufacturer warranty confirmed from the warranty card
- Insured worldwide delivery
- Payment by bank transfer or cryptocurrency
- Registered Australian dealerHYPA International Pty Ltd · Victorian Second-Hand Dealer Licence SHD-0018017.
- Direct specialist supportSpeak with the HYPA team before, during and after the purchase.
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