Custom Watch Cases and Components for the La Joux-Perret L100 Movement

We can produce watch cases, casebacks, and other components compatible with the La Joux-Perret L100 movement.

We specialize in custom-made high-end watches and can manufacture cases and accessories tailored to the La Joux-Perret L100 (Calibre L100). If you are interested, feel free to contact us to discuss the details.

Below is a brief introduction to the La Joux-Perret L100 movement:

La Joux-Perret L100 (Calibre L100) Overview

La Joux-Perret is a well-known Swiss manufacturer of mechanical movements. The L100 is a relatively new automatic chronograph movement, designed for high-end watch brands and offering significant upgrades over the traditional ETA Valjoux 7750.

🧠 Key Specifications

• Type: Automatic mechanical movement

• Chronograph: Yes — features a column-wheel chronograph, offering smoother operation and more precise actuation compared to the cam-lever system of the 7750

• Layout: Tri-Compax (30-minute, 12-hour, and small-seconds counters) with date/day display (depending on the version)

• Diameter: ~30.00 mm

• Thickness: ~7.9 mm

• Frequency: 4 Hz (28,800 vph) — smoother seconds hand motion

• Power Reserve: About 60+ hours, a clear improvement over the ~48 hours of the 7750

• Jewels: Around 26 jewels (automatic version)

• Compatibility: Similar case dimensions to ETA 7750 / Sellita SW500, making it suitable for watches designed around these movements

🕰️ Technical Features

✔ Column-wheel chronograph
Provides a more refined, crisp, and smooth pusher feel, a characteristic of higher-end chronograph movements.

✔ Extended power reserve
Improved to around 60 hours or more, ensuring continued operation even if the watch is not worn for a day or two.

✔ Automatic & manual winding
Standard version uses automatic unidirectional winding, with manual winding capability depending on configuration.

📌 Usage & Brands

The L100 is used in higher-end chronograph watches from brands such as Frederique Constant, Fortis, Zelos, and others. It maintains the reliability of the traditional 7750 while offering modern upgrades—including a column-wheel system, longer power reserve, and improved performance—making it increasingly popular among mid-to-high-end Swiss mechanical watches.