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 43 mm Green Stainless
Reference 68974ST.50
Reference at a glance
- Brand
- Jacob & Co.
- Collection
- Five Time Zone
- Model
- Jacob & Co. Five Time Zone 43 mm Green Stainless
- Reference number
- 68974ST.50
- Year / era
- 1988 · 1980s — mechanical revival
- Complication
- Perpetual calendar
- Movement
- In-house tourbillon, manual-winding
- Case material
- Stainless steel
- Dial type
- Green sunburst
- Strap / bracelet
- Oyster bracelet
- Water resistance
- 300 m
- Limited-edition status
- Limited edition of 500 pieces
Case, dial & bracelet
- Case dimensions
- 43 mm
- Case thickness
- 8.1 mm
- Case material
- Stainless steel
- Bezel
- Bidirectional 24-hour Cerachrom
- Crystal
- Sapphire with internal AR treatment
- Dial
- Green sunburst
- Hands
- Rhodium-plated baton hands with luminous fill
- Indexes
- Applied faceted white-gold indexes
- Bracelet / strap
- Oyster bracelet
- Clasp / buckle
- Titanium deployant clasp
- Water resistance
- 300 m
Movement
- Movement / calibre
- Calibre 17C — In-house tourbillon, manual-winding
- Movement type
- High-frequency automatic
- Frequency
- 28,800 vph (4 Hz)
- Power reserve
- 65 hours
- Number of jewels
- 21 jewels
- Complications
- Perpetual calendar
- Functions
- Dive time, running seconds
- Watchmaker
- The calibre is built in-house and adjusted in five positions before delivery.
Production & market
- Production period
- 1988 – 2003
- Limited-edition quantity
- 500 pieces
- Current market information
- Trades close to retail on the secondary market, with steady demand for full-set examples.
Designer
Gérald Genta
Gérald Genta (1931–2011) trained as a goldsmith in Geneva and became the most influential watch designer of the 20th century. Working freelance, he sketched the Audemars Piguet Royal Oak overnight in 1970, followed by the Patek Philippe Nautilus, the IWC Ingenieur SL and the Bulgari Bulgari — defining the integrated-bracelet luxury sports watch as a category.
Historical significance
Jacob & Co. Five Time Zone 43 mm Green Stainless sits within Jacob & Co.'s Five Time Zone line, introduced in 1988. It carries the house codes established since 1986 — stainless steel case, green sunburst dial and in-house tourbillon, manual-winding — 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 reference was originally planned as a one-year run and stayed in the catalogue for well over a decade.
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 42 mm Skeletonised Platinum
Ref. 62370OR.88
Jacob & Co. Five Time Zone 39 mm Silvered Stainless
Ref. 73779ST.81
Jacob & Co. Five Time Zone 42 mm Blue Carbon
Ref. 47396OR.97