Specifications
- Reference
- 5303-1
- Family
- Chronomètre Plongée
- Category
- Dive
- Status
- Current
- Case material
- Stainless steel
- Case diameter
- 39 mm
- Case thickness
- 12.2 mm Official
- Lug-to-lug
- 46.5 mm Official
- Lug width
- 20 mm Official
- Water resistance
- 300 m
- Bezel
- Rotating, diver
- Certifications
- COSC
- Calibre
- M100 Official
Official product page · retrieved October 25, 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 46.5 mm on a flat top of 54.1 mm: 86 % 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 |
|---|---|---|---|
| 12.2 mm | Official | Serica | October 25, 2026 |
Lug-to-lug
| Value | Type | Source | Date |
|---|---|---|---|
| 46.5 mm | Official | Serica | October 25, 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 |
|---|---|---|---|
| 20 mm | Official | Serica | October 25, 2026 |
Calibre source
Official Serica · retrieved October 25, 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 Serica models
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| Chronomètre Voyage 8315 8315-1 | 39 mm | 12.3 mm | 46.5 mm | C125 GMT |
| Chronomètre 6190 6190-1 M.S.L. | 38 mm | 10.4 mm | 46.5 mm | M100 |
| Chronomètre Étanche 7505 7505-1 | 35 mm | 9.6 mm | 41.5 mm | M100 |
| Parade 1174 1174-1 | 35 mm | 8.2 mm | — | M100 |