Zenith

El Primero and Chronomaster

The El Primero arrived in 1969 as the first automatic chronograph running at 36,000 vibrations per hour, which lets it measure to a tenth of a second. Chronomaster Original keeps the 1969 proportions and the tricolour subdials; Chronomaster Sport puts the same idea in a modern ceramic-bezel case with a 1/10th-second scale. Chronomaster Open cuts a window in the dial to show the escapement.

Defy, Pilot and Elite

Defy is where Zenith puts its high-frequency experiments: Defy El Primero 21 runs a separate chronograph escapement at 360,000 vph for 1/100th-second timing, Defy Classic and Defy Midnight are the cleaner skeleton and women's takes on the faceted case. Pilot descends from Zenith's aviation instruments and keeps the oversized onion crown and cathedral hands. Elite is the slim automatic dress calibre.

Sizing and daily wear

Zenith cases are moderate by modern standards. Chronomaster Original holds the original 38mm, which is why it has become the connoisseur's pick, while Chronomaster Sport moves to 41mm with a ceramic bezel. Defy runs 41mm to 44mm depending on reference, and the skeletonised versions wear lighter than they look in titanium. Pilot is the largest of the families. Tell us your wrist size and intended use and we will point you at the right case.

Servicing and value

The El Primero is a high-beat movement, which means it rewards being serviced on schedule rather than left. We check running condition and amplitude before listing, describe what we find, and note box and papers where present. Zenith remains one of the better-value ways into serious in-house chronograph watchmaking. Pieces listed as price on request are available on enquiry, and we buy and trade Zenith.