Which brand introduced the first high-frequency wristwatch with an integrated chronograph?

The brand that introduced the first high-frequency wristwatch with an integrated chronograph is Zenith. In 1969, Zenith launched the El Primero, a revolutionary timepiece that operated at a frequency of 36,000 vibrations per hour (vph), significantly higher than the standard at the time. This high-frequency movement allowed for improved accuracy and precision, making it especially suitable for chronograph functions, which require exact timing for measuring elapsed intervals. The El Primero was also notable for being a fully integrated movement, meaning the chronograph was designed from the outset within the same mechanical architecture, a feat that contributed to its efficiency and reliability.

Zenith's innovation laid the groundwork for many modern chronographs and established the brand as a leader in high-performance watchmaking, particularly in relation to chronograph technology. This historic development had a lasting impact on the watch industry, showcasing how advancements in movement design can enhance the functionality and performance of wristwatches.