Zenith, as most of you reading this are probably aware by now, introduced the El Primero chronograph caliber in 1969. It was notable for, among other aspects, its uncommonly high frequency of 36,600 vph (5 Hz), which in practical terms meant that its chronograph could record elapsed times not just to the second but to the 1/10th second. In most watches that housed the movement, however, the dial was not designed to actually record these minuscule measurements in an easily legible way. For the new Chronomaster Sport, unveiled today ahead of LVMH Watch Week, Zenith remedied this, adding an ultra-readable ceramic bezel with an etched, graduated 1/10th-second display.

Ref. 03.3100.3600/21.M3100 on steel bracelet

The Chronomaster Sport marks, according to Zenith, “a new era for the quintessential Zenith sporty-chic chronograph,” the El Primero-equipped Chronomaster, whose more recent variations have included more retro-influenced models like the Chronomaster A385 Revival. The new model bears some of these vintage influences: its sleek, 41-mm steel case features the pump-style chronograph pushers of earlier models, and the tricompax dial (in either matte black or matte white) hosts a set of overlapping subdials in the classic El Primero colors of blue, anthracite, and light gray, just as they appeared on the classic A386 model from 1969.
Ref. 03.3100.3600/21.M3100 on cordura-effect rubber strap

The subdials’ colors reflect those of 1969 El Primero mo...