Zenith Chronomaster Sport Steel — El Primero Black Dial | Ref. 03.3100.3600/21.M3100

Sport and sophistication collide in the Chronomaster Sport, a 41 mm proposition that occupies the high ground between tool watch and collector's grail. The case marries steel with ceramic for a construction that laughs at scratches and maintains its lustre under conditions that would punish lesser materials. Against this robust architecture, a black-lacquered dial with three differently coloured chronograph counters creates a command centre of controlled visual energy — each subdial a distinct accent in an otherwise purposeful layout.

The movement is the El Primero at its most ambitious: a calibre offering 1/10th of a second chronograph resolution, running at 36,000 vph with approximately 60 hours of power reserve. That extra hour reserve over earlier El Primero variants reflects ongoing refinement — the movement breathes, keeps better time, and sustains performance across longer intervals without winding. This is the technical heart that separates Zenith's sporting proposition from the field.

A steel bracelet completes the ensemble with the durability and confidence the collection demands, water resistant to 10 ATM. Ref. 03.3100.3600/21.M3100 makes no apologies for its ambitions — it is a sports chronograph built by a manufacture with over 150 years of continuous production, and it wears that heritage visibly, robustly, and beautifully.