Oris Aquis vs Seiko SPB143 (62MAS)
Swiss independence meets Japanese precision diving
Quick Verdict
The Oris Aquis ($1,500–$2,500) offers Swiss independent manufacture credibility with its relief-textured dial and Caliber 400 upgrade path, while the Seiko SPB143 ($1,000–$1,500) delivers 90% of the build quality at 54% of the price with the beloved 62MAS heritage design.
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Specifications Compared
| Feature | Oris Aquis Date Calibre 400 | Seiko Prospex 62MAS Modern Re-interpretation |
|---|---|---|
| Price | $2,500–$5,000 | $1,000–$1,500 |
| Case Size | 41.5mm | 40.5mm |
| Movement | Automatic Calibre 400 | Automatic 6R35 |
| Caliber Type | Oris In-House Manufacture | Seiko In-House Automatic |
| Power Reserve | 120 Hours (5 Days) | 70 Hours |
| Water Resistance | 300m (30 ATM) | 200m (20 ATM) |
| Crystal | Sapphire Crystal with Anti-Reflective Coating | Sapphire |
| Case Material | Stainless Steel | Stainless Steel with Super-Hard Coating |
| Origin | Swiss Made | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Both stunning — different approaches to dive watch design
The Aquis has a bold, modern look with a relief-textured dial that creates depth and dimension. The SPB143 channels the 1965 62MAS — Seiko's first dive watch — with a slimmer, more vintage-inspired profile. Both are excellent; the Oris is more modern, the Seiko more heritage.
Movement & Performance
Both are reliable workhorses with similar specs
The Aquis runs the Sellita SW200-1 (38hr reserve, 28,800 vph) while the SPB143 uses Seiko's 6R35 (70hr reserve, 21,600 vph). The Seiko actually has nearly double the power reserve. Both hack and handwind. Accuracy is similar at ±10-15 sec/day.
Wearability & Fit
The SPB143 is more refined on smaller wrists
The Aquis at 41.5mm × 13.2mm is a substantial watch. The SPB143 at 40.5mm × 13.2mm with shorter lugs wears more compactly. The Seiko's slimmer bezel also makes the dial feel larger relative to the case size.
Value & Cost of Ownership
Seiko offers dramatically better value
At $1,000–$1,500 versus $1,500–$2,500, the SPB143 saves roughly a thousand dollars. Seiko's service costs are also lower (~$200-300 vs ~$350-450 for Oris). The 6R35's 70-hour power reserve means less time on the winder, too.
Brand Heritage
Both are fiercely independent manufacturers
Oris (est. 1904) is one of the few remaining independent Swiss watch companies. Seiko (est. 1881) is vertically integrated — they make everything from hairsprings to cases. Both represent authentic watchmaking without conglomerate ownership.
Materials Face-Off
| Component | Oris Aquis Date Calibre 400 | Seiko Prospex 62MAS Modern Re-interpretation |
|---|---|---|
| Movement | Oris Caliber 733 | Seiko Caliber 6R35 |
| Crystal | Domed sapphire with anti-reflective coating on inside | Sapphire with anti-reflective coating on inner surface |
| Case | Stainless steel 316L (brushed and polished) | Stainless steel with Seiko's "Super-Hard Coating" (Diashield) |
| Bezel | Unidirectional rotating, scratch-resistant ceramic insert with 60-min dive scale and lume pip | Unidirectional rotating, anodized aluminum insert with 60-minute dive scale and lume pip at 12 |
Cost of Ownership Compared
The Seiko Prospex 62MAS Modern Re-interpretation saves you $1,229 over 5 years of ownership
Who Should Pick Which
Pick the Oris Aquis Date Calibre 400 if…
- Dive watch enthusiasts — 300m water resistance is proper dive spec
- Those who prioritize scratch resistance — sapphire crystal
- Dive watch collectors who appreciate proper ISO-rated tool watches
- Buyers who prefer a commanding wrist presence — 43mm case
Pick the Seiko Prospex 62MAS Modern Re-interpretation if…
- Enthusiasts wanting proven Swiss/Japanese quality in the $1,000–$2,000 sweet spot
- Dive watch enthusiasts — 200m water resistance is proper dive spec
- Weekend warriors — 70-hour power reserve means it survives two days off the wrist
- Those who prioritize scratch resistance — sapphire crystal
- Dive watch collectors who appreciate proper ISO-rated tool watches
Oris Aquis Date Calibre 400
- Sellita base movement at this price — fair value but not in-house prestige (Caliber 400 variants resolve).
- 43.5mm large for smaller wrists (smaller variants available).
- Proprietary endlinks limit strap options.
Seiko Prospex 62MAS Modern Re-interpretation
- Chapter ring alignment QC inconsistency.
- Aluminum bezel insert (vs ceramic on Tudor / Omega).
- 6R35 accuracy varies unit-to-unit.
Our Verdict
Oris
Aquis Date Calibre 400
Choose the Oris Aquis if you want to support an independent Swiss manufacture and want a more substantial, modern dive watch. The relief-textured dial is stunning, and the Aquis's build quality is genuinely impressive for the price.
Check Price on AmazonSeiko
Prospex 62MAS Modern Re-interpretation
Choose the Seiko SPB143 if you want arguably the best value in dive watches. The 62MAS heritage design is iconic, the 6R35 movement is a workhorse, and you save roughly a thousand dollars while getting a watch that punches far above its weight.
Check Price on AmazonThe Bottom Line
The Oris Aquis Date Relief in the $1,500–$2,500 band and the Seiko SPB143 in the $1,000–$1,500 band represent the two best mid-tier dive watches from independent manufacturers — Oris from Switzerland and Seiko from Japan.
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How This Page Was Made
Our comparisons are generated from a hand-maintained specification database and reviewed under our editorial standards. We use AI tools to assemble pages from that data. We don’t invent specs: every number traces back to the database, and when we correct an entry, the fix is applied site-wide. As an Amazon Associate, The Horologist earns from qualifying purchases.