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 · Speedmaster
Omega Speedmaster 38 mm Slate Sapphire
Reference 28513OR.87
Reference at a glance
- Brand
- Omega
- Collection
- Speedmaster
- Model
- Omega Speedmaster 38 mm Slate Sapphire
- Reference number
- 28513OR.87
- Year / era
- 1961 · 1960s — pre-quartz mechanical era
- Complication
- Perpetual calendar
- Movement
- In-house manual-winding
- Case material
- Sapphire crystal case
- Dial type
- Slate grey
- Strap / bracelet
- White rubber velcro strap
- Water resistance
- 100 m
- Limited-edition status
- Regular production, not a limited edition
Case, dial & bracelet
- Case dimensions
- 38 mm
- Case thickness
- 8.8 mm
- Case material
- Sapphire crystal case
- Bezel
- Unidirectional ceramic 60-minute
- Crystal
- Box sapphire with AR coating
- Dial
- Slate grey
- Hands
- Rhodium-plated baton hands with luminous fill
- Indexes
- Applied faceted white-gold indexes
- Bracelet / strap
- White rubber velcro strap
- Clasp / buckle
- Titanium deployant clasp
- Water resistance
- 100 m
Movement
- Movement / calibre
- Calibre 6D — In-house manual-winding
- Movement type
- High-frequency automatic
- Frequency
- 28,800 vph (4 Hz)
- Power reserve
- 70 hours
- Number of jewels
- 21 jewels
- Complications
- Perpetual calendar
- Functions
- GMT second time zone, date
- Watchmaker
- Finishing, assembly and timing are carried out in the manufacture's own atelier.
Production & market
- Production period
- 1961 – 1973
- Limited-edition quantity
- Not applicable
- Current market information
- Trades close to retail on the secondary market, with steady demand for full-set examples.
Designer
Claude Baillod
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
Omega Speedmaster 38 mm Slate Sapphire sits within Omega's Speedmaster line, introduced in 1961. It carries the house codes established since 1848 — sapphire crystal case case, slate grey dial and in-house manual-winding — and is one of the references collectors use to date the evolution of the collection.
Interesting facts
- 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.