Constant Girard (1825–1903) was a pivotal Swiss watchmaker whose technical innovations and entrepreneurial vision laid the foundation for the modern Girard-Perregaux manufacture. Born in La Chaux-de-Fonds, Girard began his career as an apprentice in La Sagne before entering a partnership with C. Robert between 1845 and 1850. By 1852, he had established his own firm, Girard & Cie, alongside his brother Numa.

A defining moment in Girard’s life occurred in 1854 when he married Marie Perregaux, who came from a prominent family of watch merchants. In 1856, the couple merged their names to establish the Girard-Perregaux manufacture in La Chaux-de-Fonds. This union was not only personal but also strategically significant, as it allowed the brand to expand its commercial reach through the Perregaux family’s established trading networks in the Americas and Japan.

Girard is most renowned for his revolutionary work on escapement systems, specifically the tourbillon. He sought to transform the tourbillon from a purely functional component into an aesthetic centerpiece of the watch. His most famous achievement, the Tourbillon with Three Gold Bridges, featured a movement architecture where three parallel, arrow-shaped gold bridges held the mechanism in place. This design was patented in the United States in 1884 and earned a gold medal at the 1889 Paris Universal Exhibition.

In addition to his work with pocket watches, Girard is often credited with one of the first major commercial productions of wristwatches. In 1880, following an order from German Emperor Wilhelm I, he developed 2,000 wristwatches for German naval officers. These timepieces featured a metal grid to protect the glass, representing an early precursor to the modern wristwatch, though the concept did not achieve widespread popularity until the early 20th century.

Throughout his career, Girard remained deeply involved in the social and economic life of La Chaux-de-Fonds. Following his death in 1903, he was succeeded by his son, Constant Girard-Gallet, who further expanded the company by acquiring the historic Bautte house in 1906. Today, Constant Girard’s legacy persists through the continued production of the Three Gold Bridges design, which remains an iconic symbol of Swiss horological heritage.