René Besson: The Father of the Daytona

René Besson: The Father of the Daytona

At the beating heart of Rolex's modern history, there is a name that deserves to be remembered with respect and admiration: René Besson.

Rolex's Technical Director from 1985 to 1998, Besson arrives from the prestigious Ebauches SA, where he was already known as a brilliant technical director. His career at Rolex was marked by innovation, engineering vision, and an extraordinary ability to translate mechanical excellence into enduring masterpieces.

Caliber 4130: the silent revolution

Until 2000, the Rolex Daytona—one of the world's most iconic chronographs—relied on calibers derived from the Valjoux 72 and later from the Zenith El Primero (the famous 4030). But it was with the launch of Caliber 4130, first featured in the reference 116520, that a turning point occurred: Rolex finally introduced a completely in-house chronograph movement.
René Besson himself led this revolution. His contributions were so profound and incisive that journalist Jean-Bernard Vuillème (Le Temps) called him "the father of the Daytona chronograph." Technical innovation and Swiss perfectionism The 4130 brought with it extraordinary innovations:

• Vertical clutch, which eliminated the classic "jump" of the chronograph hand when starting and allowed for continuous and stable chronograph operation.
• Simplified architecture compared to the 4030, with a reduction in moving parts to improve reliability and maintenance.
• Integration of the best of the 3130 series, Rolex's three-hand self-winding caliber, enriching it with design improvements derived from critical analysis of the movements' weaknesses. Previous.

As Vuillème emphasized:
"Rolex took everything that was good about the 3130 and put it into a chronograph. But they went further: they rethought the entire concept with the sole aim of improving its robustness, efficiency, and precision."

A legacy of patents (and dreams)

René Besson didn't stop at the 4130. Throughout his career, he filed numerous patents that testify to his cutting-edge technical vision. Some of these concern visionary designs for watches that never entered production: mechanical dreams that remain hidden in drawers in Geneva.