The Zenith El Primero Survived Because a Watchmaker Hid It in the Attic

On January 10, 1969, Zenith unveiled a movement it called El Primero, Spanish for the first. The name was a claim. Watchonista calls it the first automatic chronograph, and Wikipedia the first high-frequency automatic chronograph movement. It beat at 36,000 vibrations an hour, fast enough to time an event to a tenth of a second.

Within a few years the company that made it had been sold, quartz was in fashion and the order came down to stop production. That should have been the end of the story. It was not, because a senior engineer named Charles Vermot decided the tools were worth more than the order.

The race of 1969

Zenith was an old house by then. Georges Favre-Jacot began making watches in Le Locle, in the Swiss Jura, in 1865. A century later Swiss watchmaking had a gap in its catalog. Chronographs had to be wound by hand, and several companies were racing to build one that wound itself.

The rival camp was the Calibre 11 group. Heuer, Breitling and Hamilton held press conferences on March 3, 1969, to show their jointly developed Chronomatic movement, the engine in our Heuer Monaco history and in the automatic Breitling Navitimer. Zenith had gone public with El Primero two months earlier.

The two designs were very different. The Calibre 11 was a modular build, a chronograph unit sat on top of an automatic base. Zenith's calibre 3019 PHC was integrated, designed as one movement from the start. Phillips describes it as the world's first high-frequency automatic column-wheel chronograph, and says it took more than seven years of research and development.

Why the beat rate matters

El Primero ran at 36,000 vibrations an hour, which is 5 hertz. Each vibration is one swing of the balance, so the arithmetic gives ten steps of the seconds hand every second. That is why the chronograph can be read to a tenth of a second, and why Phillips calls it the first high-frequency automatic column-wheel chronograph.

Zenith kept faith with the number for more than half a century. The modern El Primero 400, used in the 2019 revival of the original watch, still beats at 5 hertz and holds a 50 hour power reserve, according to Gear Patrol.

The first watch to carry it was the A386, a 38mm steel chronograph. Gear Patrol describes the 2019 revival's case as historically accurate 38mm sizing.

The attic at Les Ponts-de-Martel

Zenith did not stay Swiss for long. An American electronics company that also traded under the Zenith name bought the watchmaker. Phillips dates the sale to 1971 and Wikipedia to 1972. The new owners saw quartz as the future and the mechanical chronograph as expensive and obsolete, the same shakeout we tell in our history of Swatch and the quartz crisis.

Watchonista says the order to stop production came in 1975, along with instructions to get rid of the El Primero tooling. Charles Vermot, then head of development for the department that made the movement blanks, did not comply. He hid the plans, parts and tools behind a false wall in the attic. Wikipedia places that attic at the company's facility in Les Ponts-de-Martel. Phillips dates Vermot's work to 1976. Accounts agree on the substance even where they disagree by a year.

The material sat there for close to a decade. Watchonista says the company passed back into Swiss hands in 1984, and that Vermot's hidden tooling let Zenith restart El Primero production instead of designing it again from nothing.

Rolex calls

The timing was lucky. In the early 1980s Rolex wanted an automatic movement for its Daytona chronograph. Phillips says that when Rolex made contact, Vermot showed the executive team what he had saved. From 1988 Zenith supplied movements built to Rolex specifications for the Daytona reference 16520. Rolex removed the date and lowered the beat rate, and called the result the calibre 4030.

That arrangement ran until 2000, when Rolex launched its own calibre 4130 and Zenith took back full control of its movement. In between, in November 1999, LVMH bought Zenith for $48.4 million, according to Wikipedia.

El Primero, step by step

Here is the movement's life as Phillips, Wikipedia, Watchonista and Gear Patrol tell it. The dates in dispute are shown as a range.

By our arithmetic, the Daytona arrangement lasted 12 years, longer than the original El Primero had been in production before it was ordered shut down.

The El Primero now

Zenith has pushed the idea further since. Watchonista notes that the 2017 Defy El Primero 21 measures to a hundredth of a second, and that the Defy Inventor runs at 18 hertz. The original logic, a fast balance and a single integrated chronograph, still sits at the center of the catalog.

Zenith has looked further back too. Wikipedia records a 2022 collaboration with the independent watchmaker Kari Voutilainen that revived the Calibre 135, an older Zenith movement, in a run of 11 watches. For a brand whose most famous movement was nearly thrown away, it is a telling choice. The archive is now treated as an asset rather than a cost.

For the buyer, the lesson is the one that applies to any vintage chronograph. Service history matters more than the dial. Read our guide on how to buy your first mechanical watch before you pay for a Zenith Daytona, and see watch history and the Quiet Menace watches section for more. Phillips on the five key dates is the clearest short account of the attic story.

Plenty of movements were killed by quartz. This one was put in a box and kept, by a man who decided an order was wrong. Every El Primero sold since owes him that.