The seller represents this timepiece as being in very good condition. It includes the boxes (inner and outer), additional items, and papers dated June 2021.

The Pinnacle of Modern Chronographs: The Zenith Chronomaster Sport (Ref. 03.3100.3600/21.M3100) Own a piece of horological history modernized for the fast lane. Zenith completely revolutionized watchmaking in 1969 by releasing the El Primero—the world's first integrated, high-frequency automatic chronograph movement. This stunning 41mm Zenith Chronomaster Sport honors that legendary legacy while delivering an unmistakably contemporary edge. Framed by a sleek, scratch-resistant black ceramic bezel, its deep black lacquer dial features the brand's iconic signature: the overlapping, tri-color subdials in shades of anthracite, grey, and blue. Paired with a robust, integrated stainless steel bracelet, this watch beautifully balances historic DNA with everyday versatility. What truly sets this model apart is the mechanical genius visible through the sapphire exhibition case back. It is powered by the next-generation In-House El Primero 3600 calibre, a high-beat movement operating at a blistering 36,000 vibrations per hour (5Hz). Because it beats so rapidly, the striking red central chronograph hand doesn't just circle the dial every 60 seconds; it flies around the dial in a lightning-fast 10 seconds, allowing you to flawlessly measure intervals down to 1/10th of a second right on the ceramic bezel. Boasting a beefed-up 60-hour power reserve and 100 meters of water resistance, this model represents the ultimate cross-section of high-performance engineering and striking sports style.