Seiko SRPG57
Ref. SRPG57 · In production
- Case42.4 mm
- Thick13.4 mm
- Lug-to-lug49.4 mm
- Water res.200 m
- MovementAutomatic
- CrystalHardlex (mineral)
Seiko SRPG57 size, specs and price at a glance
The Seiko SRPG57 is 42.4 mm wide and 13.4 mm thick, with a lug-to-lug length of 49.4 mm. It takes 20 mm straps and ships on a bracelet. Inside is the 4R36 automatic calibre, water resistant to 200 m. US list price: $550 when we last checked seikowatches.com (29 Oct 2026).
Strap shopping? See our lug width chart.
Overview
The Seiko SRPG57 is a diver watch from the Prospex collection, part of the Sea family. It has a 42.4 mm stainless steel case, 13.4 mm thick, 49.4 mm from lug to lug. Inside is an automatic movement (calibre 4R36) with 41 h of power reserve. You also get 200 m water resistance, a hardlex (mineral) crystal and a bracelet.
Who it suits
- Wrists of roughly 17.0–18.9 cm (6.7–7.4 in), by our Watch Finder sizing guide
- Swimming, snorkelling and diving
Strengths
- Certified to the ISO 6425 diver's standard (200 m)
- Screw-down crown helps keep water out
- Hacks and hand-winds, so it is easy to set
Trade-offs
- Hardlex (mineral) crystal scratches more easily than sapphire
- 41 h power reserve: it stops after about a day and a half off the wrist
- Heavy at 186 g
Written by Watch.co from the published specs below. These are not owner reviews.
Full specifications
Case
| Case diameter | 42.4 mm | seikowatches.com · 29 Oct 2026 |
|---|---|---|
| Thickness | 13.4 mm | seikowatches.com · 29 Oct 2026 |
| Lug-to-lug | 49.4 mm | seikowatches.com · 29 Oct 2026 |
| Case material | Stainless steel | seikowatches.com · 29 Oct 2026 |
| Crystal | Hardlex (mineral) | seikowatches.com · 29 Oct 2026 |
| Caseback | Screw | seikowatches.com · 29 Oct 2026 |
| Bezel | Unidirectional rotating | seikowatches.com · 29 Oct 2026 |
| Water resistance | 200 m | seikowatches.com · 29 Oct 2026 |
| Screw-down crown | Yes | seikowatches.com · 29 Oct 2026 |
| ISO 6425 diver | Yes | seikowatches.com · 29 Oct 2026 |
| Weight | 186 g | seikowatches.com · 29 Oct 2026 |
Dial
| Luminous material | LumiBrite | seikowatches.com · 29 Oct 2026 |
|---|---|---|
| Date | Day/Date | our classification |
Movement
| Movement type | Automatic | seikowatches.com · 29 Oct 2026 |
|---|---|---|
| Calibre | 4R36 | seikowatches.com · 29 Oct 2026 |
| Made in-house | Yes | seikowatches.com · 29 Oct 2026 |
| Power reserve | 41 h | seikowatches.com · 29 Oct 2026 |
| Hacking seconds | Yes | seikowatches.com · 29 Oct 2026 |
| Hand-winding | Yes | seikowatches.com · 29 Oct 2026 |
Strap / Bracelet
| Bracelet / strap | Bracelet | seikowatches.com · 29 Oct 2026 |
|---|---|---|
| Lug width | 20 mm | seikowatches.com · 29 Oct 2026 |
Other
| US list price (MSRP) | $550 | seikowatches.com · 29 Oct 2026 |
|---|---|---|
| Production status | In production | seikowatches.com · 29 Oct 2026 |
| Style (our classification) | Diver | 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.
Variants with the same specs
Same case, movement and bracelet or strap; typically a different dial or finish.
More in Sea
Similar alternatives
Picked with Watch Finder's style tags and sizing.
Questions about the Seiko SRPG57
How big is the Seiko SRPG57?
The case is 42.4 mm wide, 13.4 mm thick and 49.4 mm from lug to lug.
What movement does the Seiko SRPG57 use?
It uses the 4R36 calibre, a automatic movement with 41 h of power reserve.
Can I swim with the Seiko SRPG57?
Yes. It is rated to 200 m and certified as an ISO 6425 diver.
Does the Seiko SRPG57 have a date?
Yes, it shows the day and date.
How much is the Seiko SRPG57?
The US list price was $550 on seikowatches.com when we checked on 29 Oct 2026. Prices change, so check before you buy.
Will the Seiko SRPG57 fit my wrist?
By our sizing guide it sits best on wrists of about 17.0–18.9 cm (6.7–7.4 in). Use the fit checker on this page to test your own wrist.
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