Seiko HBC003
Ref. HBC003 · In production
- Case39.5 mm
- Thick12 mm
- Lug-to-lug44.5 mm
- Water res.200 m
- MovementAutomatic
- CrystalSapphire
Overview
The Seiko HBC003 is a diver watch from the Prospex collection, part of the SPEEDTIMER family. It has a 39.5 mm stainless steel case, 12 mm thick, 44.5 mm from lug to lug. Inside is a automatic movement (calibre 6R55) with 72 h of power reserve. You also get 200 m water resistance, a sapphire crystal and a bracelet.
Who it suits
- Wrists of roughly 15.7–17.7 cm (6.2–7.0 in), by our Watch Finder sizing guide
- Swimming, snorkelling and diving
Strengths
- Sapphire crystal resists scratches
- 200 m water resistance
- 72 h power reserve survives a weekend off the wrist
- Compact 44.5 mm lug-to-lug suits smaller wrists
- Hacks and hand-winds, so it is easy to set
Written by Watch.co from the published specs below. These are not owner reviews.
Full specifications
Case
| Case diameter | 39.5 mm | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Thickness | 12 mm | seikowatches.com · 23 Oct 2026 |
| Lug-to-lug | 44.5 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 | 200 m | seikowatches.com · 23 Oct 2026 |
| Magnetic resistance | 4,800 A/m | seikowatches.com · 23 Oct 2026 |
Dial
| Luminous material | LumiBrite | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Date | Date | our classification |
Movement
| Movement type | Automatic | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Calibre | 6R55 | seikowatches.com · 23 Oct 2026 |
| Made in-house | Yes | seikowatches.com · 23 Oct 2026 |
| Power reserve | 72 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) | $995 | seikowatches.com · 23 Oct 2026 |
|---|---|---|
| Production status | In production | seikowatches.com · 23 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 SPEEDTIMER
Similar alternatives
Picked with Watch Finder's style tags and sizing.
Questions about the Seiko HBC003
How big is the Seiko HBC003?
The case is 39.5 mm wide, 12 mm thick and 44.5 mm from lug to lug.
What movement does the Seiko HBC003 use?
It uses the 6R55 calibre, a automatic movement with 72 h of power reserve.
Can I swim with the Seiko HBC003?
Yes. It is rated to 200 m.
Does the Seiko HBC003 have a date?
Yes, it shows the date.
How much is the Seiko HBC003?
The US list price was $995 on seikowatches.com when we checked on 23 Oct 2026. Prices change, so check before you buy.
Will the Seiko HBC003 fit my wrist?
By our sizing guide it sits best on wrists of about 15.7–17.7 cm (6.2–7.0 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.