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 · Railmaster
Omega Railmaster 38 mm Skeletonised Carbon
Reference 10900OR.21
Reference at a glance
- Brand
- Omega
- Collection
- Railmaster
- Model
- Omega Railmaster 38 mm Skeletonised Carbon
- Reference number
- 10900OR.21
- Year / era
- 1953 · 1950s — pre-quartz mechanical era
- Complication
- Chronograph
- Movement
- In-house manual-winding
- Case material
- Carbon TPT
- Dial type
- Skeletonised
- Strap / bracelet
- Milanese mesh
- Water resistance
- 500 m
- Limited-edition status
- Regular production, not a limited edition
Case, dial & bracelet
- Case dimensions
- 38 mm
- Case thickness
- 8.8 mm
- Case material
- Carbon TPT
- Bezel
- Baguette diamond rainbow
- Crystal
- Anti-reflective sapphire, double-domed
- Dial
- Skeletonised
- Hands
- Mercedes hour hand with Chromalight display
- Indexes
- Applied Arabic numerals with luminous coating
- Bracelet / strap
- Milanese mesh
- Clasp / buckle
- Titanium deployant clasp
- Water resistance
- 500 m
Movement
- Movement / calibre
- Calibre 13F — In-house manual-winding
- Movement type
- Manual-winding
- Frequency
- 21,600 vph (3 Hz)
- Power reserve
- 72 hours
- Number of jewels
- 27 jewels
- Complications
- Chronograph
- Functions
- Perpetual calendar, leap year
- Watchmaker
- Finishing, assembly and timing are carried out in the manufacture's own atelier.
Production & market
- Production period
- 1953 – 1965
- Limited-edition quantity
- Not applicable
- Current market information
- Consistently trades above retail; waiting lists at authorised dealers remain long.
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
Omega Railmaster 38 mm Skeletonised Carbon sits within Omega's Railmaster line, introduced in 1953. It carries the house codes established since 1848 — carbon tpt case, skeletonised dial and in-house manual-winding — 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.
- 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.