Zenith El Primero Chronomaster Sport (Ref. 03.3100.3600/69.M3100), 2024

Dealer description — Huntington Company

History and Significance Zenith’s El Primero has always held a unique place in chronograph history. Introduced in 1969 as one of the first automatic chronograph movements, it stood apart for its high frequency, beating at 36,000 vibrations per hour. That higher beat rate allows for more precise time measurement, something Zenith has continued to emphasize even in its modern executions. The Chronomaster Sport takes that legacy and translates it into a contemporary format. The case is more substantial than earlier Zenith chronographs, with a ceramic bezel and a refined bracelet that bring it closer to modern expectations while still keeping the core design intact. The signature tri-color subdials remain, though presented here in a more restrained palette that feels cohesive and easy to wear. What makes this reference especially interesting is the updated El Primero 3600 movement. It allows the central chronograph hand to complete a full rotation every 10 seconds, making it possible to read 1/10th of a second directly from the dial. It is a technical feature that you can actually see in use, rather than something hidden behind the scenes. There is a balance here between heritage and usability that Zenith tends to get right. It still feels like an El Primero, but it wears like a modern daily watch. Writer’s Thoughts The proportions feel right, and the bracelet gives it a solid, everyday presence without making it feel heavy. The dial is perfectly laid out; in person, it reads clean, especially with the lighter color layout. It’s also just a reliable option if someone wants a modern chronograph with real history behind it, without going in a more obvious direction. Our Promise Every watch is thoroughly vetted, carefully described with complete transparency, and guaranteed authentic. Each piece is offered in honest condition, ensuring collectors receive a timepiece that reflects both originality and integrity. Specifications Brand: Zenith Model: Chronomaster Sport (Ref. 03.3100.3600/69.M3100) Year: 2024 Case Material: Stainless steel Case Size: 41mm Dial: White dial with tri-color subdials Movement: Automatic Zenith El Primero 3600 Strap/Bracelet: Stainless steel bracelet Buckle/Clasp: Zenith folding clasp Contents: Box, papers, and booklets Condition Case: Shows light wear consistent with use, with strong overall condition. Dial: Dial is clean with no imperfections. Hands: Hands are clean. Crystal: Crystal is clear with no signs of wear. Strap/Bracelet: Bracelet is in excellent condition, with no stretch and only light wear.