Specifications
- Reference
- 03.4000.3620/21.I001
- Family
- Pilot
- Category
- Tool
- Status
- Current
- Case material
- Stainless steel
- Case diameter
- 40 mm
- Case thickness
- 12.85 mm Official
- Lug-to-lug
- —
- Lug width
- —
- Water resistance
- 100 m
- Bezel
- —
- Calibre
- El Primero 3620 Official
- Frequency
- 36,000 vph (5 Hz)
Official product page · retrieved October 18, 2026
Does it fit your wrist?
Enter your wrist circumference. The watch appears to scale on the flat top of the wrist.
No lug-to-lug figure exists for this reference yet, so fit cannot be computed.
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 |
|---|---|---|---|
| 12.85 mm | Official | Zenith | October 18, 2026 |
Lug-to-lug
No source gave this figure yet.
Lug width
Lug width is the gap between the lugs, where the strap fits. It is not lug-to-lug.
No source gave this figure yet.
Calibre source
Official Zenith · retrieved October 18, 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 Pilot references
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| Pilot Automatic (ceramic) 49.4000.3620/21.I001 | 40 mm | 12.85 mm | — | El Primero 3620 |
| Pilot Big Date Flyback (steel) 03.4000.3652/21.I001 | 42.5 mm | 14.25 mm | — | El Primero 3652 |
| Pilot Big Date Flyback (ceramic) 49.4000.3652/21.I001 | 42.5 mm | 14.25 mm | — | El Primero 3652 |
Other Zenith models
| Watch | Ø | Thickness | Lug-to-lug | Calibre |
|---|---|---|---|---|
| Chronomaster Solo Sport 03.5000.3620/21.M5000 | 40 mm | 13.13 mm | — | El Primero 3620 |
| DEFY Skyline (steel, 41 mm) 03.9300.3620/01.I001 | 41 mm | 11.6 mm | — | El Primero 3620 |
| DEFY Skyline Skeleton (steel) 03.9300.3620/78.I001 | 41 mm | 11.6 mm | — | El Primero 3620 |
| DEFY Skyline Skeleton (18 ct rose gold) 18.9300.3630/78.I001 | 41 mm | 12.2 mm | — | El Primero 3630 |
| DEFY Skyline Skeleton (ceramic) 49.9300.3620/07.I001 | 41 mm | 11.6 mm | — | El Primero 3620 |
| DEFY Skyline (steel, 36 mm) 03.9400.670/01.I001 | 36 mm | 10.35 mm | — | Elite 670 |