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.
Jacob & Co. · Five Time Zone
Jacob & Co. Five Time Zone 42 mm Skeletonised Platinum
Reference 62370OR.88
Reference at a glance
- Brand
- Jacob & Co.
- Collection
- Five Time Zone
- Model
- Jacob & Co. Five Time Zone 42 mm Skeletonised Platinum
- Reference number
- 62370OR.88
- Year / era
- 2018 · 2010s — modern production
- Complication
- GMT / second time zone
- Movement
- In-house manual-winding, hand-finished
- Case material
- Platinum 950
- Dial type
- Skeletonised
- Strap / bracelet
- Oyster bracelet
- Water resistance
- 500 m
- Limited-edition status
- Regular production, not a limited edition
Case, dial & bracelet
- Case dimensions
- 42 mm
- Case thickness
- 8.8 mm
- Case material
- Platinum 950
- Bezel
- Fluted 18k gold
- Crystal
- Box sapphire with AR coating
- Dial
- Skeletonised
- Hands
- Skeletonised sword hands, white luminescent
- Indexes
- Applied Roman numerals
- Bracelet / strap
- Oyster bracelet
- Clasp / buckle
- Titanium deployant clasp
- Water resistance
- 500 m
Movement
- Movement / calibre
- Calibre 9F — In-house manual-winding, hand-finished
- Movement type
- Manual-winding
- Frequency
- 36,000 vph (5 Hz)
- Power reserve
- 38 hours
- Number of jewels
- 31 jewels
- Complications
- GMT / second time zone
- Functions
- Flying tourbillon, power reserve
- Watchmaker
- The calibre is built in-house and adjusted in five positions before delivery.
Production & market
- Production period
- 2018 – 2032
- Limited-edition quantity
- Not applicable
- Current market information
- Consistently trades above retail; waiting lists at authorised dealers remain long.
Designer
In-house design studio
The reference was drawn by the manufacture's internal design office, where case, dial and movement architects work alongside the watchmakers rather than as an outside commission.
Historical significance
Jacob & Co. Five Time Zone 42 mm Skeletonised Platinum sits within Jacob & Co.'s Five Time Zone line, introduced in 2018. It carries the house codes established since 1986 — platinum 950 case, skeletonised dial and in-house manual-winding, hand-finished — and is one of the references collectors use to date the evolution of the collection.
Interesting facts
- The bracelet tapers across its length, which is why the profile looks thinner on the wrist than the specification suggests.
- The movement's bridges are decorated even where they will never be seen once the watch is cased.
The House
Jacob & Co.
Brand facts
- Founding year
- 1986
- Founder
- Jacob Arabo
- Headquarters
- United States
- Tier
- Ultra-Luxury & Haute Horlogerie
- Major collections
- Astronomia, Billionaire, Bugatti Chiron, Casino Tourbillon, Epic X, Twin Turbo Furious, Five Time Zone
- Signature technologies
- Anti-magnetic silicon escapement · Hand-applied guilloché dials · Composite and ceramic case materials
- 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
- Jacob & Co. Astronomia 40 mm Meteorite 18k (2001) · Jacob & Co. Astronomia 42 mm Blue Sapphire (2002) · Jacob & Co. Astronomia 42 mm Skeletonised Carbon (1986) · Jacob & Co. Astronomia 39 mm Green Platinum (2002)
Brand history
Jacob & Co. has spent more than 40 years refining a single idea: a watch should outlive its owner. From the earliest workshop pieces to today's Astronomia, the house has balanced technical ambition with a recognisable design language, and its collections remain among the most closely followed by collectors worldwide.
Jacob Arabo established Jacob & Co. in 1986, working from United States at a time when precision was measured by hand. The founder's obsession with finishing and accuracy still defines every Jacob & Co. calibre produced today.
Historical milestones
1986
Jacob Arabo founds Jacob & Co. in United States.
1990
Jacob & Co. enters the modern collector market with its signature lines.
2024
Jacob & Co. continues to produce Astronomia, Billionaire, Bugatti Chiron and other icons in limited numbers.
More Five Time Zone
Jacob & Co. Five Time Zone 40 mm Ice Ceramic
Ref. 40583OR.76
Jacob & Co. Five Time Zone 43 mm Black Stainless
Ref. 67777ST.21
Jacob & Co. Five Time Zone 43 mm Green Stainless
Ref. 68974ST.50
Jacob & Co. Five Time Zone 39 mm Silvered Stainless
Ref. 73779ST.81
Jacob & Co. Five Time Zone 42 mm Blue Carbon
Ref. 47396OR.97