Zenith
Calibre El Primero 3652
Automatic chronograph
Specifications
- Maker
- Zenith
- Type
- Automatic chronograph
- In-house
- Yes
- Power reserve
- about 60 h
- Frequency
- 36,000 vph (5 Hz)
Sources
- Official Zenith retrieved October 18, 2026
Used in
| Watch | Ø | Thickness | Lug-to-lug |
|---|---|---|---|
| Zenith Pilot Big Date Flyback (steel) 03.4000.3652/21.I001 | 42.5 mm | 14.25 mm | — |
| Zenith Pilot Big Date Flyback (ceramic) 49.4000.3652/21.I001 | 42.5 mm | 14.25 mm | — |