Seiko SRPB77
Ref. SRPB77 · In production
- Case40.5 mm
- Thick11.8 mm
- Water res.50 m
- MovementAutomatic
- CrystalHardlex (mineral)
Seiko SRPB77 size, specs and price at a glance
The Seiko SRPB77 is 40.5 mm wide and 11.8 mm thick. Seiko does not publish its lug-to-lug length. It takes 20 mm straps and ships on a bracelet. Inside is the 4R35 automatic calibre, water resistant to 50 m.
Strap shopping? See our lug width chart.
Overview
The Seiko SRPB77 is a dress watch from the Presage collection. It has a 40.5 mm stainless steel case, 11.8 mm thick. Inside is an automatic movement (calibre 4R35) 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 16.2–18.1 cm (6.4–7.1 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 | 40.5 mm | seikowatches.com · 29 Oct 2026 |
|---|---|---|
| Thickness | 11.8 mm | seikowatches.com · 29 Oct 2026 |
| Lug-to-lug | Not published by Seiko | |
| Case material | Stainless steel | seikowatches.com · 29 Oct 2026 |
| Crystal | Hardlex (mineral) | seikowatches.com · 29 Oct 2026 |
| Caseback | Display (see-through) | seikowatches.com · 29 Oct 2026 |
| Water resistance | 50 m | seikowatches.com · 29 Oct 2026 |
Dial
| Date | Date | our classification |
|---|
Movement
| Movement type | Automatic | seikowatches.com · 29 Oct 2026 |
|---|---|---|
| Calibre | 4R35 | 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
| Production status | In production | seikowatches.com · 29 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.
More in Presage
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Questions about the Seiko SRPB77
How big is the Seiko SRPB77?
The case is 40.5 mm wide, 11.8 mm thick.
What movement does the Seiko SRPB77 use?
It uses the 4R35 calibre, a automatic movement with 41 h of power reserve.
Can I swim with the Seiko SRPB77?
Not really. It is rated to 50 m.
Does the Seiko SRPB77 have a date?
Yes, it shows the date.
Will the Seiko SRPB77 fit my wrist?
By our sizing guide it sits best on wrists of about 16.2–18.1 cm (6.4–7.1 in). Use the fit checker on this page to test your own wrist.
Watch.co is independent and not affiliated with any brand. Brand names are used only to identify products.