Reef Chronometer
A COSC dive chronometer with a ceramic bezel and Formex's signature suspension case — engineering-led tool watch that wears far smaller than its specs.
Sensei Score — Excellent
Punches well above its price. A standout pick.
Independent rating. Purchase links may be affiliate.
Sensei Says
The specs, in plain English
The movement
Sellita SW300-1. An upper-tier movement: tighter regulation, better materials and a longer power reserve. You feel the quality in the winding and the rate.
On the wrist
At 42 mm it has present, sporty proportions, a 48 mm lug-to-lug suits most wrists.
The value
You're paying for quality, and it shows.
Specifications
- Reference
- REEF-300-BLU
- Released
- 2022
- Production
- Current production
- Movement
- Automatic
- Calibre
- Sellita SW300-1
- Movement tier
- Upper-tier
- Power reserve
- 56 h
- Case diameter
- 42 mm
- Lug-to-lug
- 48 mm
- Thickness
- 12.3 mm
- Lug width
- 22 mm
- Case shape
- Round
- Case material
- Stainless steel, Ceramic bezel
- Water resistance
- 300 m
- Crystal
- Sapphire · AR both sides
- Bezel
- Dive (unidirectional)
- Caseback
- Engraved
- Dial colour
- Blue
- Dial finish
- Sunburst
- Indices
- Applied
- Lume
- Yes — Super-LumiNova BGW9
- Strap / bracelet
- Steel bracelet (fine-adjust clasp)
- Clasp
- Fine-adjust deployant
- Functions
- Hours, Minutes, Seconds, Date
- Fit
- Men's
- Originality
- Original
The Gateway
If you love these grails
Shared design language, not a clone. Here's where this piece meets taste you already know.
Ceramic-bezel, 300m, chronometer-grade dive watch in the Submariner template — but engineered to wear soft, and priced to make sense.
The maker
Formex
Engineering as design.
In the same spirit
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