Seiko SRPB43 'Cocktail Time'
Ref. SRPB43 · In production
- Case40.5 mm
- Thick11.8 mm
- Water res.50 m
- MovementAutomatic
- CrystalHardlex (Cocktail Time)
Overview
The Seiko SRPB43 is a dress watch from the Presage collection, part of the Seiko Presage family. It has a 40.5 mm stainless steel case, 11.8 mm thick. Inside is a automatic movement (calibre 4R35 (Cocktail Time)) with 41 h of power reserve. You also get 50 m water resistance and a hardlex (cocktail time) crystal.
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
Trade-offs
- Hardlex (Cocktail Time) 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 · 23 Oct 2026 |
|---|---|---|
| Thickness | 11.8 mm | seikowatches.com · 23 Oct 2026 |
| Case material | Stainless steel | seikowatches.com · 23 Oct 2026 |
| Crystal | Hardlex (Cocktail Time) | seikowatches.com · 23 Oct 2026 |
| Water resistance | 50 m | seikowatches.com · 23 Oct 2026 |
Movement
| Movement type | Automatic | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Calibre | 4R35 (Cocktail Time) | seikowatches.com · 23 Oct 2026 |
| Power reserve | 41 h | seikowatches.com · 23 Oct 2026 |
Strap / Bracelet
| Lug width | 20 mm | seikowatches.com · 23 Oct 2026 |
|---|
Other
| US list price (MSRP) | $450 | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Production status | In production | seikowatches.com · 23 Oct 2026 |
| Style (our classification) | Dress | seikowatches.com · 23 Oct 2026 |
| Nickname | Cocktail Time | 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 SRPB43
How big is the Seiko SRPB43?
The case is 40.5 mm wide, 11.8 mm thick.
What movement does the Seiko SRPB43 use?
It uses the 4R35 (Cocktail Time) calibre, a automatic movement with 41 h of power reserve.
Can I swim with the Seiko SRPB43?
Not really. It is rated to 50 m.
How much is the Seiko SRPB43?
The US list price was $450 on seikowatches.com when we checked on 23 Oct 2026. Prices change, so check before you buy.
Will the Seiko SRPB43 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.
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