<p class="font_8">**Zenith Chronomaster Chronograph 01.0240.400 Review by A.I. WatchMetrics**

### Watch Summary

The Zenith Chronomaster Chronograph 01.0240.400 is a distinguished timepiece that embodies the brand's commitment to precision and innovation. Classified primarily as a Sport/Active watch, it features a robust design suitable for both professional and casual settings. The watch is powered by the renowned El Primero automatic movement, known for its high-frequency chronograph capabilities, offering a power reserve of approximately 50 hours. This model is ideal for watch enthusiasts who appreciate technical excellence and historical significance, as the El Primero movement was one of the first automatic chronograph calibers introduced in 1969. The Chronomaster's appeal lies in its blend of classic design elements with advanced horological technology, making it a versatile choice for those who value both style and functionality.

### Overall Watch Rating: 8.2/10.0

- **Movement Metric (9.0/10.0)**
- The watch is equipped with the El Primero 400 automatic movement, celebrated for its high-frequency operation at 36,000 vibrations per hour, ensuring exceptional accuracy and smooth chronograph function. The movement's historical significance and technical complexity contribute to its high rating.

- **History &amp; Innovation Metric (8.8/10.0)**
- Zenith's El Primero movement is a landmark in watchmaking history, being one of the first automatic chronographs. This model continues to uphold the brand's legacy of innovation and precision.

- **Functions Metric (8.5/10.0)**
- The Chronomaster offers a robust set of features, including a chronograph function, date display, and a tachymetric scale, enhancing its practicality for everyday use and sports activities.

- **Dials &amp; Design Metric (8.4/10.0)**
- The watch features a classic and elegant dial design with applied markers and a tachymetric scale, providing both aesthetic appeal and functional clarity.

- **Material Metric (8.2/10.0)**
- Constructed with high-quality stainless steel, the watch offers durability and a polished finish, though it lacks the use of more exotic materials.

- **Versatility Metric (8.0/10.0)**
- The Chronomaster's design and features make it suitable for a variety of settings, from professional environments to casual outings, though it is primarily oriented towards sports and active use.

- **Rarity Metric (7.8/10.0)**
- While the El Primero movement is iconic, the Chronomaster model is relatively accessible, limiting its rarity score.

- **Brand Metric (7.5/10.0)**
- Zenith is a respected brand with a strong heritage in horology, particularly known for its El Primero movement, though it does not have the same market presence as some luxury competitors.

- **Complications Metric (7.4/10.0)**
- The watch includes a chronograph and date function, which are common complications, but lacks more advanced features like a perpetual calendar or moonphase.

### Celebrity and Historical Figures

- **Charles Vermot** – A key figure in preserving the El Primero movement during the quartz crisis, ensuring its legacy continued.
- **Felix Baumgartner** – Austrian skydiver and BASE jumper, known for wearing Zenith watches during his record-breaking freefall from the stratosphere.

This review highlights the Zenith Chronomaster Chronograph 01.0240.400 as a well-rounded timepiece that excels in movement innovation and historical significance, making it a valuable addition to any watch collection.</p>