Zenith Chronomaster Sport Skeleton Stainless Steel / Green Ref. 03.3131.3600/01.M3130

The Zenith Chronomaster Sport Skeleton 03.3131.3600/01.M3130 debuted in 2026 as a stainless steel version of the openworked Chronomaster Sport with a green ceramic bezel. Within the Chronomaster Sport Skeleton line, this reference stands apart through its monochrome treatment of the sub-dials, which are executed in three shades of grey rather than the signature blue-accented tri-colour arrangement of the black-bezel version. Its 41mm case is executed in stainless steel and combines brushed and polished surfaces with classic pump-style chronograph pushers. The bezel is made of green ceramic and graduated over 10 seconds, allowing the central chronograph hand, which completes one full rotation every 10 seconds, to display elapsed tenths of a second directly. Zenith rates water resistance at 10 ATM. This version is delivered on a stainless steel bracelet and accompanied by an additional green rubber strap. The dial is constructed in tinted sapphire, smoked from the periphery towards the centre, revealing the skeletonized architecture of the El Primero 3600 SK beneath. In this execution, the counters are rendered in three shades of grey, giving the watch a more tonal and more restrained appearance than the version with blue, anthracite, and grey registers. Faceted rhodium-plated hands and applied hour markers are coated with Super-LumiNova C1, maintaining legibility against the openworked display. The column wheel and horizontal clutch construction remain visible through both the dial and the caseback. Inside is the El Primero 3600 SK, an automatic high-frequency column-wheel chronograph movement operating at 36,000 vibrations per hour, or 5Hz, with a power reserve of approximately 60 hours. It displays central hours and minutes, small seconds at 9 o’clock, and a 1/10th of a second chronograph with a central hand making one revolution in 10 seconds, alongside a 60-minute counter at 6 o’clock and a 60-second counter at 3 o’clock. The movement incorporates a silicon escape wheel and lever, a stop-seconds mechanism, and an openworked star-shaped oscillating weight. As with the other stainless steel Chronomaster Sport Skeleton references, this version is fitted with Zenith’s patented micro-adjustable folding clasp. The clasp allows on-wrist adjustment in 2.5mm increments across a total range of 10mm, adding a practical ergonomic refinement to the steel bracelet and forming a key part of this generation’s overall update.