Grand Seiko · Sport
Grand Seiko Sport SBGJ237 Mechanical GMT
Reference SBGJ237G · GMT / travel · 44.2 mm
Specifications
- Reference
- SBGJ237G
- Family
- Sport
- Category
- GMT / travel
- Status
- Current
- Case material
- Stainless steel
- Case diameter
- 44.2 mm
- Case thickness
- 14.4 mm Official
- Lug-to-lug
- 50.6 mm Official
- Lug width
- 21 mm Official
- Water resistance
- 200 m
- Bezel
- Rotating, 24 h (GMT)
- Calibre
- 9S86 Official
- Power reserve
- about 55 h
Official product page · retrieved October 14, 2026
Does it fit your wrist?
Enter your wrist circumference. The watch appears to scale on the flat top of the wrist.
Comfortable
Lug-to-lug 50.6 mm on a flat top of 54.1 mm: 94 % of the width.
Lug-to-lug is 75 to 95% of the flat top, the usual comfortable range.
Measurements and sources
Brands rarely publish thickness, lug width and lug-to-lug together. Each observation below is kept separate, with who gave it.
Case thickness
| Value | Type | Source | Date |
|---|---|---|---|
| 14.4 mm | Official | Grand Seiko | October 14, 2026 |
Lug-to-lug
| Value | Type | Source | Date |
|---|---|---|---|
| 50.6 mm | Official | Grand Seiko | October 14, 2026 |
Lug width
Lug width is the gap between the lugs, where the strap fits. It is not lug-to-lug.
| Value | Type | Source | Date |
|---|---|---|---|
| 21 mm | Official | Grand Seiko Published as “band width”. | October 14, 2026 |
Calibre source
Official Grand Seiko · retrieved October 14, 2026
Other versions in the same case
These references differ only by dial, bracelet or bezel colour. The brand gives them the same case dimensions, so the figures on this page apply to them too.
Other Sport references
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| Sport SBGE277 Spring Drive GMT SBGE277G | 44 mm | 14.7 mm | 50.8 mm | 9R66 |
| Sport SBGE257 Spring Drive GMT SBGE257G | 40.5 mm | 14.7 mm | 48.7 mm | 9R66 |
| Sport SBGM247 GMT SBGM247G | 40.5 mm | 14.4 mm | 48.6 mm | 9S66 |
Other Grand Seiko models
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| Elegance SBGM221 GMT SBGM221G | 39.5 mm | 13.7 mm | 46.9 mm | 9S66 |
| Evolution 9 SLGC001 Tentagraph SLGC001G | 43.2 mm | 15.3 mm | 51.5 mm | 9SC5 |
| Heritage SBGA211 “Snowflake” SBGA211G | 41 mm | 12.5 mm | 49 mm | 9R65 |
| Elegance SBGA407 “Skyflake” SBGA407G | 40.2 mm | 12.8 mm | 48.5 mm | 9R65 |
| Evolution 9 SLGH005 “White Birch” SLGH005G | 40 mm | 11.7 mm | 47 mm | 9SA5 |
| Evolution 9 SLGA019 SLGA019G | 40 mm | 11.8 mm | 47.9 mm | 9RA2 |
Show 6 more
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| Heritage SBGA413 SBGA413G | 40 mm | 12.8 mm | 47 mm | 9R65 |
| Elegance SBGY007 “Omiwatari” SBGY007G | 38.5 mm | 10.2 mm | 43.7 mm | 9R31 |
| Elegance SBGW301 SBGW301G | 37.3 mm | 11.7 mm | 44.3 mm | 9S64 |
| Evolution 9 SLGW003 SLGW003G | 38.6 mm | 10 mm | 45 mm | 9SA4 |
| Evolution 9 SLGB003 SLGB003G | 37 mm | 11.4 mm | 44.3 mm | 9RB2 |
| Heritage SBGH341 SBGH341G | 38 mm | 12.9 mm | 44.7 mm | 9S85 |