- Case
- Tonneau
- Size
- 49.90 × 42.70 × 13.05 mm
Overview
A black RM 055 on a record that says grey
The photograph on this record shows a matte black RM 055 — black bezel, black caseband, black strap — with a blue ring around the dial flange and a dark skeletonised calibre RMUL2 behind it.
The record is named for the All Grey, a boutique edition with a sandblasted titanium carbide bezel, polished bevelling along its edges and a black chapter ring around the dial. This watch has none of those features. Which of the two is wrong — the name or the picture — cannot be established from the record, so nothing beyond the movement specification and what the photograph shows is entered here.
Key details
MovementCalibre RMUL2, manual winding, skeletonised
Power reserveCirca 55 hours
Case materialNot established
Design and engineering
- What is not establishedThe record’s name and its photograph describe different watches. The All Grey’s documented features — a sandblasted titanium carbide bezel, polished bevels, a black chapter ring — are absent from this image, so none of them is written here.
- Calibre RMUL2Manual winding and extremely skeletonised, in grade 5 titanium with PVD and Titalyt® treatment, giving rigidity and the surface flatness the gear train needs.
- Free-sprung balance with variable inertiaThe regulator index is eliminated; four small weights set directly on the balance allow accurate and repeatable adjustment.
- Double barrelEnergy is spread across two barrels, equalising torque and reducing pressure and friction on bearings and pivots.
- Rubberised case componentsRubber is injected at high pressure around the titanium components, insulating the movement from vibration and making the watch more comfortable on the wrist.
- Sapphire casebackThe skeletonised calibre is legible from the reverse.
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 |
| Balance | Free sprung, variable inertia, 4 adjustable weights |
| Barrels | Double barrel |
| Shock resistance | Over 500 g |
| Baseplate and bridges | Grade 5 titanium, PVD and Titalyt® treated |
| Case | Tonneau |
| Case dimensions | 49.90 × 42.70 × 13.05 mm |
| Strap | Black rubber |
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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