Casio
Casio Pro Trek 40 mm Ice Sapphire
Photography on request
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.
Casio · Pro Trek
Casio Pro Trek 40 mm Ice Sapphire
Reference 50458OR.63
Reference at a glance
- Brand
- Casio
- Collection
- Pro Trek
- Model
- Casio Pro Trek 40 mm Ice Sapphire
- Reference number
- 50458OR.63
- Year / era
- 1975 · 1970s — quartz-crisis era
- Complication
- Annual calendar
- Movement
- High-accuracy quartz
- Case material
- Sapphire crystal case
- Dial type
- Ice blue
- Strap / bracelet
- Rubber strap with titanium clasp
- Water resistance
- 300 m
- Limited-edition status
- Regular production, not a limited edition
Case, dial & bracelet
- Case dimensions
- 40 mm
- Case thickness
- 9.4 mm
- Case material
- Sapphire crystal case
- Bezel
- Emerald-set
- Crystal
- Flat sapphire with Cyclops lens
- Dial
- Ice blue
- Hands
- Blued steel Breguet-style hands
- Indexes
- Diamond-set hour markers
- Bracelet / strap
- Rubber strap with titanium clasp
- Clasp / buckle
- Folding clasp in matching case metal
- Water resistance
- 300 m
Movement
- Movement / calibre
- Calibre 8A — High-accuracy quartz
- Movement type
- Automatic, self-winding
- Frequency
- 21,600 vph (3 Hz)
- Power reserve
- 5 days
- Number of jewels
- 27 jewels
- Complications
- Annual calendar
- Functions
- Dive time, running seconds
- Watchmaker
- The calibre is built in-house and adjusted in five positions before delivery.
Production & market
- Production period
- 1975 – 1978
- Limited-edition quantity
- Not applicable
- 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
Casio Pro Trek 40 mm Ice Sapphire sits within Casio's Pro Trek line, introduced in 1975. It carries the house codes established since 1946 — sapphire crystal case case, ice blue dial and high-accuracy quartz — 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
Casio
Brand facts
- Founding year
- 1946
- Founder
- Tadao Kashio
- Headquarters
- Japan
- Tier
- Japanese
- Major collections
- G-Shock, Edifice, Oceanus, Pro Trek, Vintage
- Signature technologies
- In-house hairspring production · Shock-absorbing movement mounting
- Famous movements
- Spring Drive · Eco-Drive solar quartz · Automatic, 24 jewels · High-accuracy quartz
- Notable watches
- Casio G-Shock 39 mm Blue 18k (1998) · Casio G-Shock 42 mm Black Ceramic (2002) · Casio G-Shock 43 mm Salmon 18k (1985) · Casio G-Shock 42 mm Silvered Sapphire (2004)
Brand history
Casio has spent more than 80 years refining a single idea: a watch should outlive its owner. From the earliest workshop pieces to today's G-Shock, the house has balanced technical ambition with a recognisable design language, and its collections remain among the most closely followed by collectors worldwide.
Tadao Kashio established Casio in 1946, working from Japan at a time when precision was measured by hand. The founder's obsession with finishing and accuracy still defines every Casio calibre produced today.
Historical milestones
1946
Tadao Kashio founds Casio in Japan.
1969
The quartz era forces Casio to redefine mechanical watchmaking.
1990
Casio enters the modern collector market with its signature lines.
2024
Casio continues to produce G-Shock, Edifice, Oceanus and other icons in limited numbers.