A modern, sport-driven take on the El Primero lineage, this Stratos Flyback Rainbow brings Zenith's high-frequency chronograph heritage into a larger, more contemporary stainless steel case. The black dial keeps the look focused and purposeful, with the Rainbow signature adding a more technical, instrument-like edge to the design. Its automatic movement pairs flyback chronograph function with a date display. At 45.5mm, it wears with deliberate scale and a distinctly assertive wrist presence.