The Zenith Chronomaster Sport represents a pivotal moment in modern horology, marking the definitive evolution of the legendary El Primero lineage into the contemporary 'luxury sport' sector. Launched to critical acclaim, this model masterfully bridges the gap between heritage-driven design and cutting-edge mechanical performance. It is characterized by its striking tri-color overlapping sub-dials—a signature Zenith aesthetic since the A386 of 1969—set against a crisp white matte dial and framed by a polished black ceramic bezel. Unlike standard chronographs that measure eighths or tenths of a second via the central hand, the Chronomaster Sport utilizes the high-frequency El Primero 3600 caliber to track 1/10th of a second intervals with a lightning-fast central hand that completes a full rotation every ten seconds. This visual spectacle provides an immediate connection to the brand's history as a pioneer of high-frequency movements. For the collector, this piece is more than just a functional tool; it is a statement of technical superiority. It offers a compelling alternative to the ubiquitous stainless steel chronographs from competing Swiss giants, providing a more sophisticated movement architecture and a distinct design language that feels both nostalgic and futuristic. Its presence on the wrist is commanding yet refined, making it a versatile cornerstone for any serious horological portfolio.

At the heart of the Chronomaster Sport is the El Primero 3600 caliber, a high-frequency automatic movement operating at 36,000 vibrations per hour (5Hz). This increased frequency allows for greater precision and the unique 1/10th of a second chronograph functionality. The movement architecture has been optimized for efficiency, boasting a power reserve of 60 hours and a blue column-wheel mechanism visible through the sapphire crystal caseback. The case is constructed from 316L stainless steel, measuring 41mm in diameter with a lug-to-lug distance that ensures ergonomic comfort for a variety of wrist sizes. The most prominent technical feature is the fixed black ceramic bezel, which is laser-engraved with a 1/10th of a second scale, offering a scratch-resistant surface that will maintain its luster indefinitely. The dial features faceted, rhodium-plated hour markers coated with Super-LumiNova for low-light legibility. A date window is discreetly placed at 4:30, maintaining the balance of the tri-color registers in light gray, anthracite, and blue. The watch is paired with a three-link integrated steel bracelet that features a combination of brushed and polished finishes, secured by a folding clasp with a safety mechanism. With a water resistance rating of 100 meters (10 ATM), the technical build supports its classification as a true high-performance sport watch suitable for daily wear.

The history of the Chronomaster Sport is inextricably linked to the birth of the El Primero in 1969, the world's first integrated automatic chronograph movement. For decades, Zenith was the primary supplier of chronograph movements to other prestigious houses, most notably powering the Rolex Daytona for over a decade. However, the Chronomaster Sport, introduced in early 2021, represents Zenith reclaiming its throne as the master of the high-frequency chronograph. It draws direct inspiration from several historical references: the tri-color sub-dials of the A386, the bezel styling of the De Luca, and the sleek case lines of the Rainbow series. By synthesizing these elements into a single cohesive design, Zenith created a modern icon that honors its past without being trapped by it. The introduction of the 1/10th of a second display on the bezel was a direct response to the modern consumer's desire for visible mechanical complexity. This model helped revitalize the brand's image under the LVMH umbrella, positioning Zenith as a leader in 'master of chronographs' storytelling. It effectively bridged the gap between the vintage-inspired Chronomaster Revival pieces and the ultra-modern Defy collection, providing a balanced, mainstream flagship that has become the brand's most sought-after contemporary production model.