Grand Seiko SBGM257
Ref. SBGM257 · In production
- Case39.5 mm
- Thick14.1 mm
- Lug-to-lug46.9 mm
- MovementAutomatic
- CrystalSapphire
Overview
The Grand Seiko SBGM257 is a gmt watch from the Elegance collection, part of the Automatic Mechanical GMT family. It has a 39.5 mm stainless steel case, 14.1 mm thick, 46.9 mm from lug to lug. Inside is a automatic movement (calibre 9S66) with 72 h of power reserve. You also get a sapphire crystal and a bracelet.
Who it suits
- Wrists of roughly 15.8–17.7 cm (6.2–7.0 in), by our Watch Finder sizing guide
- Frequent travellers who track two time zones
- People who enjoy seeing a mechanical movement at work
Strengths
- Sapphire crystal resists scratches
- 72 h power reserve survives a weekend off the wrist
- Display caseback shows the movement
Trade-offs
- Thick at 14.1 mm: harder to slide under a cuff
Written by Watch.co from the published specs below. These are not owner reviews.
Full specifications
Case
| Case diameter | 39.5 mm | grand-seiko.com · 23 Oct 2026 |
|---|---|---|
| Thickness | 14.1 mm | grand-seiko.com · 23 Oct 2026 |
| Lug-to-lug | 46.9 mm | grand-seiko.com · 23 Oct 2026 |
| Case material | Stainless steel | grand-seiko.com · 23 Oct 2026 |
| Crystal | Sapphire | grand-seiko.com · 23 Oct 2026 |
| Anti-reflective coating | Anti-reflective coating on inner surface | grand-seiko.com · 23 Oct 2026 |
| Caseback | Display (see-through) | grand-seiko.com · 23 Oct 2026 |
| Magnetic resistance | 4,800 A/m | grand-seiko.com · 23 Oct 2026 |
| Weight | 92 g | grand-seiko.com · 23 Oct 2026 |
Dial
| Date | Date | our classification |
|---|---|---|
| GMT / second time zone | Yes | grand-seiko.com · 23 Oct 2026 |
Movement
| Movement type | Automatic | grand-seiko.com · 23 Oct 2026 |
|---|---|---|
| Calibre | 9S66 | grand-seiko.com · 23 Oct 2026 |
| Made in-house | Yes | grand-seiko.com · 23 Oct 2026 |
| Power reserve | 72 h | grand-seiko.com · 23 Oct 2026 |
| Hand-winding | Yes | grand-seiko.com · 23 Oct 2026 |
Strap / Bracelet
| Bracelet / strap | Bracelet | grand-seiko.com · 23 Oct 2026 |
|---|---|---|
| Lug width | 19 mm | grand-seiko.com · 23 Oct 2026 |
Other
| US list price (MSRP) | $5,400 | grand-seiko.com · 23 Oct 2026 |
|---|---|---|
| Production status | In production | grand-seiko.com · 23 Oct 2026 |
| Style (our classification) | GMT | 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 Automatic Mechanical GMT
Similar alternatives
Picked with Watch Finder's style tags and sizing.
Questions about the Grand Seiko SBGM257
How big is the Grand Seiko SBGM257?
The case is 39.5 mm wide, 14.1 mm thick and 46.9 mm from lug to lug.
What movement does the Grand Seiko SBGM257 use?
It uses the 9S66 calibre, a automatic movement with 72 h of power reserve.
Does the Grand Seiko SBGM257 have a date?
Yes, it shows the date.
How much is the Grand Seiko SBGM257?
The US list price was $5,400 on grand-seiko.com when we checked on 23 Oct 2026. Prices change, so check before you buy.
Will the Grand Seiko SBGM257 fit my wrist?
By our sizing guide it sits best on wrists of about 15.8–17.7 cm (6.2–7.0 in). Use the fit checker on this page to test your own wrist.
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