<p class="font_8">**Zenith El Primero Rainbow 02.0360.400 Review by A.I. WatchMetrics**

### Watch Summary:
The Zenith El Primero Rainbow 02.0360.400 is a distinguished timepiece that embodies the spirit of precision and innovation. Classified primarily as a Sport/Active watch, it is designed for those who appreciate both functionality and style. The watch features the iconic El Primero automatic movement, renowned for its high-frequency chronograph capabilities, offering a power reserve of approximately 50 hours. This model is ideal for watch enthusiasts who value historical significance and technical prowess, as it combines Zenith's rich heritage with modern design elements. Its robust build and water resistance make it suitable for active lifestyles, while its sophisticated design ensures it remains versatile enough for various occasions.

### Overall Watch Rating: 8.2/10.0

- **Movement Metric (9.0/10.0)**
- The El Primero movement, caliber 400, is celebrated for its high-frequency chronograph function, operating at 36,000 vibrations per hour. This movement is a hallmark of Zenith's innovation, providing exceptional accuracy and a smooth chronograph sweep.

- **History &amp; Innovation Metric (8.8/10.0)**
- Zenith's El Primero is a pioneering movement in the world of chronographs, being one of the first automatic chronograph calibers introduced in 1969. This model continues to uphold that legacy with its advanced features and historical significance.

- **Functions Metric (8.5/10.0)**
- The watch offers a chronograph function, date display, and water resistance suitable for everyday use. Its lume ensures readability in low-light conditions, enhancing its practicality.

- **Dials &amp; Design Metric (8.4/10.0)**
- The dial features a classic design with a tachymetric scale, applied indices, and a tri-compax layout, showcasing both functionality and aesthetic appeal. The craftsmanship is evident in the attention to detail and finishing.

- **Material Metric (8.2/10.0)**
- Constructed with high-quality stainless steel, the watch offers durability and a polished finish. The use of sapphire crystal adds to its scratch resistance and clarity.

- **Versatility Metric (8.0/10.0)**
- While primarily a sports watch, its elegant design allows it to transition seamlessly into more formal settings, making it a versatile choice for various occasions.

- **Rarity Metric (7.8/10.0)**
- As part of a limited production series, the El Primero Rainbow is relatively rare, appealing to collectors and enthusiasts who seek exclusivity.

- **Brand Metric (7.5/10.0)**
- Zenith is a respected name in the watch industry, known for its innovative movements and historical contributions. However, it lacks the widespread recognition of some other luxury brands.

- **Complications Metric (7.3/10.0)**
- The chronograph and date functions are well-executed, though the watch does not feature more advanced complications that could elevate its score further.

### Celebrity and Historical Figures:
- **Jean-Claude Biver** – Renowned watch industry executive, known for his association with Zenith and his role in promoting the El Primero movement.
- **Felix Baumgartner** – Austrian skydiver and BASE jumper, wore a Zenith El Primero during his record-breaking jump from the stratosphere, highlighting the watch's precision and reliability.

This review highlights the Zenith El Primero Rainbow 02.0360.400 as a remarkable timepiece that combines historical significance with modern functionality, making it a valuable addition to any watch collection.</p>