Seiko SSA425
Ref. SSA425 · In production
- Case40.8 mm
- Thick12.8 mm
- Lug-to-lug47 mm
- Water res.50 m
- MovementAutomatic
- CrystalHardlex (mineral)
Overview
The Seiko SSA425 is a dress watch from the Presage collection, part of the Style60's family. It has a 40.8 mm stainless steel case, 12.8 mm thick, 47 mm from lug to lug. Inside is a automatic movement (calibre 4R39) with 41 h of power reserve. You also get 50 m water resistance, a hardlex (mineral) crystal and a bracelet.
Who it suits
- Wrists of roughly 16.3–18.2 cm (6.4–7.2 in), by our Watch Finder sizing guide
- Desk and dress wear (keep it away from swimming)
- Shirt cuffs and smarter dress codes
- People who enjoy seeing a mechanical movement at work
Strengths
- Display caseback shows the movement
- Hacks and hand-winds, so it is easy to set
Trade-offs
- Hardlex (mineral) crystal scratches more easily than sapphire
- Only 50 m water resistance: splash-proof, not for swimming
- 41 h power reserve: it stops after about a day and a half off the wrist
Written by Watch.co from the published specs below. These are not owner reviews.
Full specifications
Case
| Case diameter | 40.8 mm | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Thickness | 12.8 mm | seikowatches.com · 23 Oct 2026 |
| Lug-to-lug | 47 mm | seikowatches.com · 23 Oct 2026 |
| Case material | Stainless steel | seikowatches.com · 23 Oct 2026 |
| Crystal | Hardlex (mineral) | seikowatches.com · 23 Oct 2026 |
| Caseback | Display (see-through) | seikowatches.com · 23 Oct 2026 |
| Water resistance | 50 m | seikowatches.com · 23 Oct 2026 |
| Weight | 140 g | seikowatches.com · 23 Oct 2026 |
Dial
| Luminous material | LumiBrite | seikowatches.com · 23 Oct 2026 |
|---|
Movement
| Movement type | Automatic | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Calibre | 4R39 | seikowatches.com · 23 Oct 2026 |
| Made in-house | Yes | seikowatches.com · 23 Oct 2026 |
| Power reserve | 41 h | seikowatches.com · 23 Oct 2026 |
| Hacking seconds | Yes | seikowatches.com · 23 Oct 2026 |
| Hand-winding | Yes | seikowatches.com · 23 Oct 2026 |
Strap / Bracelet
| Bracelet / strap | Bracelet | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Lug width | 20 mm | seikowatches.com · 23 Oct 2026 |
Other
| US list price (MSRP) | $595 | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Production status | In production | seikowatches.com · 23 Oct 2026 |
| Style (our classification) | Dress | our classification |
Specs are summarised in our own words from the brand's product page. Each row links its source and the date we checked it. Fields we haven't verified are left out rather than guessed.
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Questions about the Seiko SSA425
How big is the Seiko SSA425?
The case is 40.8 mm wide, 12.8 mm thick and 47 mm from lug to lug.
What movement does the Seiko SSA425 use?
It uses the 4R39 calibre, a automatic movement with 41 h of power reserve.
Can I swim with the Seiko SSA425?
Not really. It is rated to 50 m.
How much is the Seiko SSA425?
The US list price was $595 on seikowatches.com when we checked on 23 Oct 2026. Prices change, so check before you buy.
Will the Seiko SSA425 fit my wrist?
By our sizing guide it sits best on wrists of about 16.3–18.2 cm (6.4–7.2 in). Use the fit checker on this page to test your own wrist.
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