Seiko · Seiko 5 Sports
Seiko Seiko 5 Sports SKX GMT SSK001
Reference SSK001 · GMT / travel · 42.5 mm
Specifications
- Reference
- SSK001
- Family
- Seiko 5 Sports
- Category
- GMT / travel
- Status
- Current
- Case material
- Stainless steel
- Case diameter
- 42.5 mm
- Case thickness
- 13.6 mm Official
- Lug-to-lug
- 46 mm Official
- Lug width
- 22 mm Official
- Water resistance
- 100 m
- Bezel
- Rotating, 24 h (GMT)
- Calibre
- 4R34 Official
- Power reserve
- about 41 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 46 mm on a flat top of 54.1 mm: 85 % 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 |
|---|---|---|---|
| 13.6 mm | Official | Seiko | October 14, 2026 |
Lug-to-lug
| Value | Type | Source | Date |
|---|---|---|---|
| 46 mm | Official | 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 |
|---|---|---|---|
| 22 mm | Official | Seiko | October 14, 2026 |
Calibre source
Official 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 Seiko 5 Sports references
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| Seiko 5 Sports Field GMT SSK023 SSK023 | 39.4 mm | 13.6 mm | 47.9 mm | 4R34 |
Other Seiko models
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| Prospex Sea SPB519 1968 Heritage Diver's GMT SPB519J1 | 42 mm | 13.3 mm | 48.6 mm | 6R54 |
| Presage Style60's GMT SSK013 SSK013J1 | 40.8 mm | 13 mm | 47 mm | 4R34 |
| Prospex Land SPB377 Mechanical GMT SPB377J1 | 39.5 mm | 13.6 mm | 46.4 mm | 6R54 |
| Prospex Marinemaster 1968 Heritage Diver's SLA077 SLA077J1 | 42.6 mm | 13.4 mm | 49.3 mm | 8L35 |
| Prospex Sea SPB153 1970 Heritage Diver's SPB153J1 | 42.7 mm | 13.2 mm | 46.6 mm | 6R35 |
| Prospex Sea SPB481 SPB481J1 | 41.3 mm | 12.5 mm | 48.2 mm | 6R55 |
Show 16 more
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| Prospex Sea SPB077 1968 Diver's Modern Re-interpretation SPB077J1 | 44 mm | 12.7 mm | 51 mm | 6R15 |
| Prospex Sea SPB317 SPB317J1 | 41 mm | 12.3 mm | 46.9 mm | 6R35 |
| Prospex Sea SPB189 Titanium SPB189J1 | 43.5 mm | 13.3 mm | 51 mm | 6R35 |
| Prospex Sea SPB145 1965 Heritage Diver's SPB145J1 | 40.5 mm | 13.2 mm | 47.6 mm | 6R35 |
| Prospex Sea SPB101 SPB101J1 | 45 mm | 12.9 mm | 52.6 mm | 6R35 |
| Prospex SPB453 1965 Heritage Diver's SPB453J1 | 40 mm | 13 mm | 46.4 mm | 6R55 |
| Prospex Land SPB209 SPB209J1 | 39.5 mm | 13.2 mm | 46.4 mm | 6R35 |
| Prospex Land SPB503 SPB503J1 | 39.5 mm | 12.7 mm | 46.4 mm | 6R55 |
| Prospex Marinemaster 1965 Heritage Diver's SJE099J1 | 39.5 mm | 12.3 mm | 47.2 mm | 6L37 |
| Prospex Land SPB155 SPB155J1 | 38 mm | 12.9 mm | 46 mm | 6R35 |
| Prospex Land SPB241 SPB241J1 | 38 mm | 12.9 mm | 46.2 mm | 6R35 |
| Prospex Speedtimer SRQ047 Mechanical Chronograph SRQ047J1 | 42 mm | 14.6 mm | 49.5 mm | 8R48 |
| Presage Cocktail Time SRPB41 SRPB41J1 | 40.5 mm | 11.8 mm | — | 4R35 |
| Presage Classic Series SPB463 SPB463J1 | 40.2 mm | 13 mm | 46 mm | 6R55 |
| Prospex Speedtimer SPB513 Mechanical SPB513J1 | 39.5 mm | 12 mm | 44.5 mm | 6R55 |
| Presage Sharp Edged Series SPB165 SPB165J1 | 39.3 mm | 11.1 mm | 47.2 mm | 6R35 |