Zenith Chronomaster

The Chronomaster collection comprises self-winding chronographs from the Swiss manufacture Zenith. The line is united by the El Primero calibre, the high-frequency movement the brand introduced in 1969, which measures intervals to 1/10 of a second.

The collection includes both current and earlier models. The Chronomaster Sport is a men's sports chronograph in a 41 mm case with calibre El Primero 3600. The Chronomaster Open has a 39.5 mm case and calibre El Primero 3604, with an opening in the dial revealing the balance. The earlier classic series — Chronomaster T, Chronomaster XXT and El Primero Chronomaster — have cases from 40 to 45 mm and add a power reserve indicator, big date, complete calendar or moon phase to the chronograph.

Each listing gives the reference, calibre, power reserve, water resistance, condition and what is included.