Seiko · Prospex
A robust Japanese diver with restrained vintage styling, practical dimensions and strong everyday usability.
At a glance
Standardized preview
How it looks on the wrist
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Overview
Steel automatic dive watch inspired by Seiko’s 1965 diver.
History and context
SPB143 takes design cues from Seiko’s 1965 professional diver while using modern materials and specifications.
Design explained
A grey sunburst dial, broad lume plots, compact bezel and restrained case shape make it less visually aggressive than many dive watches.
Movement and technology
Automatic calibre 6R35 offers a long 70-hour reserve, although its stated accuracy range is broader than certified chronometer movements.
Manufacturing
Made in Japan within Seiko’s Prospex range, using a steel case, sapphire crystal and 200 m water resistance.
Fit and wearing experience
The 40.5 mm case and compact lug-to-lug work on many wrists, while the steel construction gives it noticeable weight.
Strengths and considerations
Strengths
- Balanced proportions
- Strong dive specification
- Long power reserve
- Versatile styling
Considerations
- Broad stated accuracy tolerance
- Bracelet and clasp divide opinion
- Heavier than titanium alternatives
Model evolution
It belongs to a modern family inspired by Seiko’s first diver, with related dial and strap variations.
Sources and verification
Specifications last verified: 2026-07-20.
Compare before choosing
Measurements tell only part of the story. Compare this watch with up to three alternatives on the same standard wrist.
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