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General| Movement | Automatic |
|---|---|
| Caliber | El Primero 3600 |
| Frequency | 36, 000 VpH (5 Hz) |
| Power Reserve | 60 hours |
| Case Material | Stainless steel |
| Water Resistance | 100 meters |
| Functions | Hours, minutes, chronograph, date |
| Bracelet/Strap | Leather strap |
Operating instructions for the chronograph functions: start, stop, resume, and reset.
Overview of the ultra-thin Elite automatic winding mechanical movement.
How to wind the chronograph mechanism of the El Primero 21.
Instructions for operating the chronograph functions of the El Primero 21.
Description of the Zenith Oscillator's high frequency and unique regulating organ.
Key features and technical specifications of the Zenith Oscillator calibre 9100.
Explanation of the Zero G Gyroscopic Escapement, a complication for rate independence.
Explanation of the Fusee-Chain principle for maintaining constant torque.
Explanation of the minute repeater mechanism and how it chimes.
Understanding the Equation of Time function and its relation to solar and civil time.
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