Seiko HBJ004
Ref. HBJ004 · In production
- Case41.4 mm
- Thick13 mm
- Lug-to-lug45.9 mm
- Water res.100 m
- MovementSolar
- CrystalSapphire
Overview
The Seiko HBJ004 is a chronograph watch from the Prospex collection, part of the SPEEDTIMER family. It has a 41.4 mm stainless steel case, 13 mm thick, 45.9 mm from lug to lug. Inside is a solar movement (calibre V192) with about 6 months (4,380 h) of power reserve. You also get 100 m water resistance, a sapphire crystal and a bracelet.
Who it suits
- Wrists of roughly 16.6–18.5 cm (6.5–7.3 in), by our Watch Finder sizing guide
- Everyday wear including swimming
- Grab-and-go wear without winding or setting
Strengths
- Sapphire crystal resists scratches
- Solar charging with about 6 months (4,380 h) of reserve
- Compact 45.9 mm lug-to-lug suits smaller wrists
Written by Watch.co from the published specs below. These are not owner reviews.
Full specifications
Case
| Case diameter | 41.4 mm | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Thickness | 13 mm | seikowatches.com · 23 Oct 2026 |
| Lug-to-lug | 45.9 mm | seikowatches.com · 23 Oct 2026 |
| Case material | Stainless steel | seikowatches.com · 23 Oct 2026 |
| Crystal | Sapphire | seikowatches.com · 23 Oct 2026 |
| Anti-reflective coating | Anti-reflective coating on inner surface | seikowatches.com · 23 Oct 2026 |
| Caseback | Screw | seikowatches.com · 23 Oct 2026 |
| Water resistance | 100 m | seikowatches.com · 23 Oct 2026 |
| Magnetic resistance | 4,800 A/m | seikowatches.com · 23 Oct 2026 |
| Weight | 168 g | seikowatches.com · 23 Oct 2026 |
Dial
| Luminous material | LumiBrite | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Date | Date | our classification |
| Chronograph | Yes | our classification |
| Power-reserve indicator | Yes | seikowatches.com · 23 Oct 2026 |
Movement
| Movement type | Solar | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Calibre | V192 | seikowatches.com · 23 Oct 2026 |
| Made in-house | Yes | seikowatches.com · 23 Oct 2026 |
| Power reserve | about 6 months (4,380 h) | seikowatches.com · 23 Oct 2026 |
Strap / Bracelet
| Bracelet / strap | Bracelet | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Lug width | 21 mm | seikowatches.com · 23 Oct 2026 |
Other
| US list price (MSRP) | $775 | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Production status | In production | seikowatches.com · 23 Oct 2026 |
| Style (our classification) | Chronograph | 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 SPEEDTIMER
Similar alternatives
Picked with Watch Finder's style tags and sizing.
Questions about the Seiko HBJ004
How big is the Seiko HBJ004?
The case is 41.4 mm wide, 13 mm thick and 45.9 mm from lug to lug.
What movement does the Seiko HBJ004 use?
It uses the V192 calibre, a solar movement with about 6 months (4,380 h) of power reserve.
Can I swim with the Seiko HBJ004?
Yes. It is rated to 100 m.
Does the Seiko HBJ004 have a date?
Yes, it shows the date.
How much is the Seiko HBJ004?
The US list price was $775 on seikowatches.com when we checked on 23 Oct 2026. Prices change, so check before you buy.
Will the Seiko HBJ004 fit my wrist?
By our sizing guide it sits best on wrists of about 16.6–18.5 cm (6.5–7.3 in). Use the fit checker on this page to test your own wrist.
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