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.
Greubel Forsey · Tourbillon 24 Secondes
Greubel Forsey Tourbillon 24 Secondes 39 mm Mother-of-pearl 18k
Reference 48370OR.23
Reference at a glance
- Brand
- Greubel Forsey
- Collection
- Tourbillon 24 Secondes
- Model
- Greubel Forsey Tourbillon 24 Secondes 39 mm Mother-of-pearl 18k
- Reference number
- 48370OR.23
- Year / era
- 2004 · 2000s — modern production
- Complication
- Time and date
- Movement
- In-house automatic micro-rotor
- Case material
- 18k white gold
- Dial type
- Mother-of-pearl
- Strap / bracelet
- Milanese mesh
- Water resistance
- 50 m
- Limited-edition status
- Limited edition of 188 pieces
Case, dial & bracelet
- Case dimensions
- 39 mm
- Case thickness
- 8.8 mm
- Case material
- 18k white gold
- Bezel
- Fixed brushed titanium
- Crystal
- Box sapphire with AR coating
- Dial
- Mother-of-pearl
- Hands
- Skeletonised sword hands, white luminescent
- Indexes
- Applied Roman numerals
- Bracelet / strap
- Milanese mesh
- Clasp / buckle
- Triple-folding clasp with safety catch
- Water resistance
- 50 m
Movement
- Movement / calibre
- Calibre 73A — In-house automatic micro-rotor
- Movement type
- High-frequency automatic
- Frequency
- 28,800 vph (4 Hz)
- Power reserve
- 70 hours
- Number of jewels
- 21 jewels
- Complications
- Time and date
- Functions
- GMT second time zone, date
- Watchmaker
- The calibre is built in-house and adjusted in five positions before delivery.
Production & market
- Production period
- 2004 – 2017
- Limited-edition quantity
- 188 pieces
- Current market information
- Trades close to retail on the secondary market, with steady demand for full-set examples.
Designer
Marc Newson
Marc Newson is an Australian industrial designer whose work spans Qantas cabins, Apple hardware and Jaeger-LeCoultre's Atmos clocks; his watch design reduces the object to pure geometry and legibility.
Historical significance
Greubel Forsey Tourbillon 24 Secondes 39 mm Mother-of-pearl 18k sits within Greubel Forsey's Tourbillon 24 Secondes line, introduced in 2004. It carries the house codes established since 2004 — 18k white gold case, mother-of-pearl 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 reference was originally planned as a one-year run and stayed in the catalogue for well over a decade.
- The case is finished by hand, alternating polished and satin-brushed surfaces in a single pass so the edges stay razor sharp.
- The movement's bridges are decorated even where they will never be seen once the watch is cased.
The House
Greubel Forsey
Brand facts
- Founding year
- 2004
- Founder
- Robert Greubel & Stephen Forsey
- Headquarters
- Switzerland
- Tier
- Ultra-Luxury & Haute Horlogerie
- Major collections
- Double Balancier, Hand Made 1, GMT, Tourbillon 24 Secondes, Balancier
- Signature technologies
- Proprietary case-hardening and polishing · Anti-magnetic silicon escapement · Hand-applied guilloché dials
- Famous movements
- In-house automatic with 22k gold rotor · In-house automatic micro-rotor · In-house manual-winding, hand-finished · In-house tourbillon, manual-winding
- Notable watches
- Greubel Forsey Double Balancier 40 mm Salmon 18k (2004) · Greubel Forsey Double Balancier 37 mm Blue Sapphire (2004) · Greubel Forsey Double Balancier 41 mm Silvered 18k (2004) · Greubel Forsey Double Balancier 42 mm Black 18k (2004)
Brand history
Greubel Forsey has spent more than 22 years refining a single idea: a watch should outlive its owner. From the earliest workshop pieces to today's Double Balancier, the house has balanced technical ambition with a recognisable design language, and its collections remain among the most closely followed by collectors worldwide.
Robert Greubel & Stephen Forsey established Greubel Forsey in 2004, working from Switzerland at a time when precision was measured by hand. The founder's obsession with finishing and accuracy still defines every Greubel Forsey calibre produced today.
Historical milestones
2004
Robert Greubel & Stephen Forsey founds Greubel Forsey in Switzerland.
2024
Greubel Forsey continues to produce Double Balancier, Hand Made 1, GMT and other icons in limited numbers.
More Tourbillon 24 Secondes
Greubel Forsey Tourbillon 24 Secondes 41 mm Silvered Grade
Ref. 10298OR.28
Greubel Forsey Tourbillon 24 Secondes 44 mm Skeletonised Platinum
Ref. 69552OR.87
Greubel Forsey Tourbillon 24 Secondes 37 mm Mother-of-pearl Stainless
Ref. 21153ST.32
Greubel Forsey Tourbillon 24 Secondes 44 mm Green Ceramic
Ref. 89332OR.18
Greubel Forsey Tourbillon 24 Secondes 42 mm Meteorite Sapphire
Ref. 33394OR.77