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.
Oris · Divers Sixty-Five
Oris Divers Sixty-Five 44 mm Skeletonised Carbon
Reference 66351OR.21
Reference at a glance
- Brand
- Oris
- Collection
- Divers Sixty-Five
- Model
- Oris Divers Sixty-Five 44 mm Skeletonised Carbon
- Reference number
- 66351OR.21
- Year / era
- 1953 · 1950s — pre-quartz mechanical era
- Complication
- Time only
- Movement
- Spring Drive
- Case material
- Carbon TPT
- Dial type
- Skeletonised
- Strap / bracelet
- Milanese mesh
- Water resistance
- 300 m
- Limited-edition status
- Regular production, not a limited edition
Case, dial & bracelet
- Case dimensions
- 44 mm
- Case thickness
- 11.3 mm
- Case material
- Carbon TPT
- Bezel
- Fluted 18k gold
- Crystal
- Flat sapphire with Cyclops lens
- Dial
- Skeletonised
- Hands
- Blued steel Breguet-style hands
- Indexes
- Applied Arabic numerals with luminous coating
- Bracelet / strap
- Milanese mesh
- Clasp / buckle
- Pin buckle in matching case metal
- Water resistance
- 300 m
Movement
- Movement / calibre
- Calibre 1A — Spring Drive
- Movement type
- Automatic with micro-rotor
- Frequency
- 28,800 vph (4 Hz)
- Power reserve
- 10 days
- Number of jewels
- 33 jewels
- Complications
- Time only
- Functions
- Annual calendar, moon phase
- Watchmaker
- Assembled and regulated by a single watchmaker, who signs off the piece before casing.
Production & market
- Production period
- 1953 – 1956
- Limited-edition quantity
- Not applicable
- Current market information
- Values have stabilised after the 2022 correction; condition and box-and-papers drive the premium.
Designer
Jörg Hysek
Jörg Hysek left Rolex and Seiko's European studios to build a design practice in Geneva, giving houses such as Vacheron Constantin, Breguet, Seiko and TAG Heuer their sculptural, architecture-led cases before founding his own brand, HD3.
Historical significance
Oris Divers Sixty-Five 44 mm Skeletonised Carbon sits within Oris's Divers Sixty-Five line, introduced in 1953. It carries the house codes established since 1904 — carbon tpt case, skeletonised dial and spring drive — 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 reference was originally planned as a one-year run and stayed in the catalogue for well over a decade.
- The case is finished by hand, alternating polished and satin-brushed surfaces in a single pass so the edges stay razor sharp.
The House
Oris
Brand facts
- Founding year
- 1904
- Founder
- Paul Cattin & Georges Christian
- Headquarters
- Switzerland
- Tier
- Premium
- Major collections
- Aquis, Big Crown, Divers Sixty-Five, ProPilot, Artelier
- Signature technologies
- Anti-magnetic silicon escapement · Composite and ceramic case materials · Hand-applied guilloché dials
- Famous movements
- Automatic, Swiss lever escapement · High-beat automatic · Automatic chronograph · Spring Drive
- Notable watches
- Oris Aquis 40 mm Mother-of-pearl Ceramic (1986) · Oris Aquis 38 mm Skeletonised Ceramic (1956) · Oris Aquis 39 mm Blue 18k (1951) · Oris Aquis 43 mm Skeletonised 18k (1985)
Brand history
Oris has spent more than 122 years refining a single idea: a watch should outlive its owner. From the earliest workshop pieces to today's Aquis, the house has balanced technical ambition with a recognisable design language, and its collections remain among the most closely followed by collectors worldwide.
Paul Cattin & Georges Christian established Oris in 1904, working from Switzerland at a time when precision was measured by hand. The founder's obsession with finishing and accuracy still defines every Oris calibre produced today.
Historical milestones
1904
Paul Cattin & Georges Christian founds Oris in Switzerland.
1969
The quartz era forces Oris to redefine mechanical watchmaking.
1990
Oris enters the modern collector market with its signature lines.
2024
Oris continues to produce Aquis, Big Crown, Divers Sixty-Five and other icons in limited numbers.
More Divers Sixty-Five
Oris Divers Sixty-Five 36 mm Green Platinum
Ref. 90865OR.69
Oris Divers Sixty-Five 39 mm Mother-of-pearl Sapphire
Ref. 32473OR.64
Oris Divers Sixty-Five 41 mm Silvered Platinum
Ref. 94905OR.51
Oris Divers Sixty-Five 36 mm Silvered Platinum
Ref. 31489OR.93
Oris Divers Sixty-Five 44 mm Green Carbon
Ref. 93114OR.29