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.
Omega · Aqua Terra
Omega Aqua Terra 42 mm Silvered 18k
Reference 66287OR.17
Reference at a glance
- Brand
- Omega
- Collection
- Aqua Terra
- Model
- Omega Aqua Terra 42 mm Silvered 18k
- Reference number
- 66287OR.17
- Year / era
- 1977 · 1970s — quartz-crisis era
- Complication
- Time and date
- Movement
- In-house automatic, chronometer certified
- Case material
- 18k yellow gold
- Dial type
- Silvered opaline
- Strap / bracelet
- Milanese mesh
- Water resistance
- 200 m
- Limited-edition status
- Limited edition of 250 pieces
Case, dial & bracelet
- Case dimensions
- 42 mm
- Case thickness
- 14.1 mm
- Case material
- 18k yellow gold
- Bezel
- Fixed brushed titanium
- Crystal
- Flat sapphire with Cyclops lens
- Dial
- Silvered opaline
- Hands
- Blued steel Breguet-style hands
- Indexes
- Applied Arabic numerals with luminous coating
- Bracelet / strap
- Milanese mesh
- Clasp / buckle
- Triple-folding clasp with safety catch
- Water resistance
- 200 m
Movement
- Movement / calibre
- Calibre 54C — In-house automatic, chronometer certified
- Movement type
- High-frequency automatic
- Frequency
- 28,800 vph (4 Hz)
- Power reserve
- 10 days
- Number of jewels
- 27 jewels
- Complications
- Time and date
- Functions
- Dive time, running seconds
- Watchmaker
- The calibre is built in-house and adjusted in five positions before delivery.
Production & market
- Production period
- 1977 – 1992
- Limited-edition quantity
- 250 pieces
- Current market information
- Consistently trades above retail; waiting lists at authorised dealers remain long.
Designer
Emmanuel Gueit
Emmanuel Gueit came from a family of Geneva jewellers and was barely into his twenties when he drew the oversized Royal Oak Offshore in 1993 — a watch the house's traditionalists resisted and collectors turned into an icon.
Historical significance
Omega Aqua Terra 42 mm Silvered 18k sits within Omega's Aqua Terra line, introduced in 1977. It carries the house codes established since 1848 — 18k yellow gold case, silvered opaline dial and in-house automatic, chronometer certified — 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 case is finished by hand, alternating polished and satin-brushed surfaces in a single pass so the edges stay razor sharp.
- Early production dials show a slightly different minute track, and collectors pay a premium for them.
The House
Omega
Brand facts
- Founding year
- 1848
- Founder
- Louis Brandt
- Headquarters
- Switzerland
- Tier
- Luxury
- Major collections
- Speedmaster, Seamaster, Constellation, De Ville, Aqua Terra, Planet Ocean, Railmaster
- Signature technologies
- Hand-applied guilloché dials · Composite and ceramic case materials · Certified chronometer regulation
- Famous movements
- In-house manual-winding · In-house automatic chronograph · In-house automatic, Superlative Chronometer · In-house automatic, chronometer certified
- Notable watches
- Omega Speedmaster 38 mm Slate Sapphire (1961) · Omega Speedmaster 39 mm Blue Quartz (1952) · Omega Speedmaster 44 mm Meteorite 18k (2001) · Omega Speedmaster 36 mm Slate 18k (1981)
Brand history
Omega has spent more than 178 years refining a single idea: a watch should outlive its owner. From the earliest workshop pieces to today's Speedmaster, the house has balanced technical ambition with a recognisable design language, and its collections remain among the most closely followed by collectors worldwide.
Louis Brandt established Omega in 1848, working from Switzerland at a time when precision was measured by hand. The founder's obsession with finishing and accuracy still defines every Omega calibre produced today.
Historical milestones
1848
Louis Brandt founds Omega in Switzerland.
1888
Omega earns its first international recognition for precision timekeeping.
1969
The quartz era forces Omega to redefine mechanical watchmaking.
1990
Omega enters the modern collector market with its signature lines.
2024
Omega continues to produce Speedmaster, Seamaster, Constellation and other icons in limited numbers.