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.
Tudor · Ranger
Tudor Ranger 36 mm Slate Grade
Reference 24451OR.13
Reference at a glance
- Brand
- Tudor
- Collection
- Ranger
- Model
- Tudor Ranger 36 mm Slate Grade
- Reference number
- 24451OR.13
- Year / era
- 1953 · 1950s — pre-quartz mechanical era
- Complication
- Moon phase
- Movement
- Spring Drive
- Case material
- Grade 5 titanium
- Dial type
- Slate grey
- Strap / bracelet
- NATO textile strap
- Water resistance
- 30 m
- Limited-edition status
- Regular production, not a limited edition
Case, dial & bracelet
- Case dimensions
- 36 mm
- Case thickness
- 10.2 mm
- Case material
- Grade 5 titanium
- Bezel
- Emerald-set
- Crystal
- Flat sapphire with Cyclops lens
- Dial
- Slate grey
- Hands
- Mercedes hour hand with Chromalight display
- Indexes
- Printed minute track with applied batons
- Bracelet / strap
- NATO textile strap
- Clasp / buckle
- Pin buckle in matching case metal
- Water resistance
- 30 m
Movement
- Movement / calibre
- Calibre 42D — Spring Drive
- Movement type
- Automatic with micro-rotor
- Frequency
- 28,800 vph (4 Hz)
- Power reserve
- 70 hours
- Number of jewels
- 21 jewels
- Complications
- Moon phase
- Functions
- GMT second time zone, date
- Watchmaker
- Assembled and regulated by a single watchmaker, who signs off the piece before casing.
Production & market
- Production period
- 1953 – 1965
- Limited-edition quantity
- Not applicable
- Current market information
- Trades close to retail on the secondary market, with steady demand for full-set examples.
Designer
In-house design studio
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
Tudor Ranger 36 mm Slate Grade sits within Tudor's Ranger line, introduced in 1953. It carries the house codes established since 1926 — grade 5 titanium case, slate grey 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 House
Tudor
Brand facts
- Founding year
- 1926
- Founder
- Hans Wilsdorf
- Headquarters
- Switzerland
- Tier
- Premium
- Major collections
- Black Bay, Pelagos, Ranger, Royal, Glamour, 1926
- Signature technologies
- In-house hairspring production · Anti-magnetic silicon escapement
- Famous movements
- Spring Drive · High-beat automatic · Automatic, Swiss lever escapement · Automatic chronograph
- Notable watches
- Tudor Black Bay 41 mm Ice Grade (1984) · Tudor Black Bay 39 mm Meteorite 18k (1951) · Tudor Black Bay 43 mm Meteorite 18k (1954) · Tudor Pelagos 39 mm Blue 18k (1997)
Brand history
Tudor has spent more than 100 years refining a single idea: a watch should outlive its owner. From the earliest workshop pieces to today's Black Bay, the house has balanced technical ambition with a recognisable design language, and its collections remain among the most closely followed by collectors worldwide.
Hans Wilsdorf established Tudor in 1926, working from Switzerland at a time when precision was measured by hand. The founder's obsession with finishing and accuracy still defines every Tudor calibre produced today.
Historical milestones
1926
Hans Wilsdorf founds Tudor in Switzerland.
1969
The quartz era forces Tudor to redefine mechanical watchmaking.
1990
Tudor enters the modern collector market with its signature lines.
2024
Tudor continues to produce Black Bay, Pelagos, Ranger and other icons in limited numbers.