Front view
Dial, hands and bezel as delivered.
Case-back view
Case-back engraving and, where fitted, the sapphire display.
Movement
Calibre with its finishing and decoration.
On the wrist
Worn shot for proportion and strap drape.
Richard Mille · RM 055
Richard Mille RM 055 36 mm Slate Sapphire
Reference 35551OR.76
Reference at a glance
- Brand
- Richard Mille
- Collection
- RM 055
- Model
- Richard Mille RM 055 36 mm Slate Sapphire
- Reference number
- 35551OR.76
- Year / era
- 2001 · 2000s — modern production
- Complication
- GMT / second time zone
- Movement
- In-house automatic micro-rotor
- Case material
- Sapphire crystal case
- Dial type
- Slate grey
- Strap / bracelet
- Jubilee bracelet
- Water resistance
- 500 m
- Limited-edition status
- Regular production, not a limited edition
Case, dial & bracelet
- Case dimensions
- 36 mm
- Case thickness
- 11.3 mm
- Case material
- Sapphire crystal case
- Bezel
- Unidirectional ceramic 60-minute
- Crystal
- Anti-reflective sapphire, double-domed
- Dial
- Slate grey
- Hands
- Blued steel Breguet-style hands
- Indexes
- Applied Arabic numerals with luminous coating
- Bracelet / strap
- Jubilee bracelet
- Clasp / buckle
- Triple-folding clasp with safety catch
- Water resistance
- 500 m
Movement
- Movement / calibre
- Calibre 59F — In-house automatic micro-rotor
- Movement type
- Manual-winding
- Frequency
- 36,000 vph (5 Hz)
- Power reserve
- 65 hours
- Number of jewels
- 25 jewels
- Complications
- GMT / second time zone
- Functions
- Flying tourbillon, power reserve
- Watchmaker
- Finishing, assembly and timing are carried out in the manufacture's own atelier.
Production & market
- Production period
- 2001 – 2007
- Limited-edition quantity
- Not applicable
- Current market information
- Trades close to retail on the secondary market, with steady demand for full-set examples.
Designer
Jörg Hysek
Jörg Hysek left Rolex and Seiko's European studios to build a design practice in Geneva, giving houses such as Vacheron Constantin, Breguet, Seiko and TAG Heuer their sculptural, architecture-led cases before founding his own brand, HD3.
Historical significance
Richard Mille RM 055 36 mm Slate Sapphire sits within Richard Mille's RM 055 line, introduced in 2001. It carries the house codes established since 2001 — sapphire crystal case case, slate grey dial and in-house automatic micro-rotor — and is one of the references collectors use to date the evolution of the collection.
Interesting facts
- The movement's bridges are decorated even where they will never be seen once the watch is cased.
- The bracelet tapers across its length, which is why the profile looks thinner on the wrist than the specification suggests.
- Early production dials show a slightly different minute track, and collectors pay a premium for them.
The House
Richard Mille
Brand facts
- Founding year
- 2001
- Founder
- Richard Mille & Dominique Guenat
- Headquarters
- Switzerland
- Tier
- Ultra-Luxury & Haute Horlogerie
- Major collections
- RM 011, RM 035, RM 055, RM 067, RM 072, RM 027, RM 030, RM 65-01, RM 07-01
- Signature technologies
- In-house hairspring production · Hand-applied guilloché dials · Proprietary case-hardening and polishing
- Famous movements
- In-house automatic micro-rotor · In-house automatic with 22k gold rotor · In-house manual-winding, hand-finished · In-house tourbillon, manual-winding
- Notable watches
- Richard Mille RM 011 43 mm Skeletonised Carbon (2001) · Richard Mille RM 011 42 mm Silvered 18k (2001) · Richard Mille RM 011 38 mm Ice Carbon (2001) · Richard Mille RM 011 42 mm Mother-of-pearl Stainless (2001)
Brand history
Richard Mille has spent more than 25 years refining a single idea: a watch should outlive its owner. From the earliest workshop pieces to today's RM 011, the house has balanced technical ambition with a recognisable design language, and its collections remain among the most closely followed by collectors worldwide.
Richard Mille & Dominique Guenat established Richard Mille in 2001, working from Switzerland at a time when precision was measured by hand. The founder's obsession with finishing and accuracy still defines every Richard Mille calibre produced today.
Historical milestones
2001
Richard Mille & Dominique Guenat founds Richard Mille in Switzerland.
2024
Richard Mille continues to produce RM 011, RM 035, RM 055 and other icons in limited numbers.
More RM 055
Richard Mille RM 055 42 mm Mother-of-pearl 18k
Ref. 51514OR.84
Richard Mille RM 055 44 mm Meteorite Stainless
Ref. 84506ST.76
Richard Mille RM 055 36 mm Green Stainless
Ref. 69690ST.95
Richard Mille RM 055 43 mm Meteorite Sapphire
Ref. 90902OR.26
Richard Mille RM 055 38 mm Meteorite Stainless
Ref. 96234ST.44