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The Encyclopedia of Horology

Movement record · Switzerland

Zenith El Primero

Partially verified

An integrated automatic chronograph running at an unusually high 36,000 vph, giving 1/10-second chronograph resolution; launched in 1969 in close competition with other automatic chronograph projects and narrowly escaped destruction during the quartz crisis.

Technical specifications

Diameter
Approx. 30 mm depending on generation
Height
Approx. 6.5 mm
Jewels
31 (typical)
Frequency
36,000 vph (5 Hz)
Power reserve
Approx. 50 hours
Winding
Self-winding, integrated column-wheel chronograph
Setting
Pull-out crown
Escapement
Swiss lever
Balance
High-frequency balance with Nivarox-type hairspring
Complications
Column-wheel chronograph, Date

Identification features

  • High-frequency 36,000 vph balance
  • Column-wheel chronograph control

Known variants

  • Original calibre 3019 PHC family
  • Later revised El Primero generations

Servicing notes

Higher frequency raises wear and lubrication demands; specialist chronograph servicing is recommended.

General guidance only. Antique movements should be serviced by a qualified watchmaker.

Historical significance

Widely cited as the first (or among the first) automatic chronograph movements and a defining achievement of late-1960s Swiss engineering.

Photographs

Zenith Watches - Zenith Men's Defy Watch, Quartz Movement, Analog Time With Red LED Display, Swiss Made, Circa 1970s (31350651573)
Zenith Watches - Zenith Men's Defy Watch, Quartz Movement, Analog Time With Red LED Display, Swiss Made, Circa 1970s (31350651573) — Joe Haupt from USA, CC BY 2.0. Wikimedia Commons file page
Zenith Watches - Zenith Defy Men's Watch, Quartz Movement, Analog With Red Digital LED Display, NOS, Swiss Made, Circa 1970s (36557339871)
Zenith Watches - Zenith Defy Men's Watch, Quartz Movement, Analog With Red Digital LED Display, NOS, Swiss Made, Circa 1970s (36557339871) — Joe Haupt from USA, CC BY-SA 2.0. Wikimedia Commons file page
Zenith Watches - Zenith Men's TimeComand Wrist Watch, Quartz Movement, Analog Time With LED Digital Readout, Swiss-Made, Circa 1970s (38097403864)
Zenith Watches - Zenith Men's TimeComand Wrist Watch, Quartz Movement, Analog Time With LED Digital Readout, Swiss-Made, Circa 1970s (38097403864) — Joe Haupt from USA, CC BY-SA 2.0. Wikimedia Commons file page

Photographs are illustrative examples of the type, not necessarily the exact object described. Verify details against the source file page.

Sources & references

  1. Zenith historical literature
  2. Industry accounts of the 1969 automatic-chronograph race, which differ on exact priority claims

Where sources disagree, the disagreement is stated rather than resolved silently.