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 SBGE257 Spring Drive GMT SBGE257G | 40.5 mm | 14.7 mm | 48.7 mm | 9R66 |
| Sport SBGE277 Spring Drive GMT SBGE277G | 44 mm | 14.7 mm | 50.8 mm | 9R66 |
| Sport SBGM247 GMT SBGM247G | 40.5 mm | 14.4 mm | 48.6 mm | 9S66 |
Same brand in the data set
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| Elegance SBGA407 “Skyflake” SBGA407G | 40.2 mm | 12.8 mm | 48.5 mm | 9R65 |
| Elegance SBGM221 GMT SBGM221G | 39.5 mm | 13.7 mm | 46.9 mm | 9S66 |
| Elegance SBGW301 SBGW301G | 37.3 mm | 11.7 mm | 44.3 mm | 9S64 |
| Elegance SBGY007 “Omiwatari” SBGY007G | 38.5 mm | 10.2 mm | 43.7 mm | 9R31 |
| Evolution 9 SLGA019 SLGA019G | 40 mm | 11.8 mm | 47.9 mm | 9RA2 |
| Evolution 9 SLGB003 SLGB003G | 37 mm | 11.4 mm | 44.3 mm | 9RB2 |
| Evolution 9 SLGC001 Tentagraph SLGC001G | 43.2 mm | 15.3 mm | 51.5 mm | 9SC5 |
| Evolution 9 SLGH005 “White Birch” SLGH005G | 40 mm | 11.7 mm | 47 mm | 9SA5 |
| Evolution 9 SLGW003 SLGW003G | 38.6 mm | 10 mm | 45 mm | 9SA4 |
| Heritage SBGA211 “Snowflake” SBGA211G | 41 mm | 12.5 mm | 49 mm | 9R65 |
| Heritage SBGA413 SBGA413G | 40 mm | 12.8 mm | 47 mm | 9R65 |
| Heritage SBGH341 SBGH341G | 38 mm | 12.9 mm | 44.7 mm | 9S85 |