The open-worked hour and minute hands, and all applied indices have Super-LumiNova inserts. Earlier El Primero movements in the Chronomaster Open line had perlage within the open heart, but the latest caliber 3604 replaces this with a contemporary, laser-engraved concentric pattern. The two sub-dials at 3 and 6 o’clock (blue and grey, respectively), and remaining dial elements are similar to the Chronomaster Sport. The small seconds sub-dial at 9 o’clock is made from hesalite (acrylic) with the silicon escape wheel at the upper left and balance wheel above. It comes in matte black or silver with the steel case, or matte silver with rose gold. The dial is an evolution of the original 2003 Chronomaster Open with multiple cutouts showing the balance, escapement and small seconds gears. A sapphire crystal protects the dial and a sapphire exhibition case back displays the latest caliber 3600. There’s a combination of brushed and polished elements, with a slim polished bezel and chamfers. The new case design is nigh identical to last year’s Chronomaster Sport with the same crown, pushers and caseband, but without the prominent ceramic bezel. There are two stainless steel models with either a black or silver dial, and a rose gold model with a silver dial. The case is 39.5mm in diameter and 13.1mm thick (lug-to-lug 45.2mm), which again is more wearable for the majority of wrists. These new Chronomaster Open watches replace the previous 42mm variant, which is now discontinued. The dial has been redesigned with cutouts displaying the entirety of the balance and escapement, and the reworked caliber 3600 features skeletonization to better showcase both. Introduced in 2003, the Chronomaster Open features an open heart design that was a first for chronographs and highlights Zenith’s high beat (5Hz) movement on the front. Zenith introduced a trio of new Chronomaster Open models at Watches & Wonders that shrink the case to a more universal size and house the latest El Primero Caliber 3600 high beat automatic.

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