The color and the way the ceramic reflects the light on the Chronomaster Sport is insistently reminiscent of the Daytona bezel, but the typeface and function are quite different – the Daytona has a tachymetric scale and the Chronomaster Sport, graduations for reading off tenths and hundredths of a second. Zenith has used ceramic bezels before in the Chronomaster line, but as far as I have been able to determine, just on the two 50th Anniversary limited edition models (which were also launch platforms for the caliber 3600). I think what makes the resemblance seem so strong at first glance is the ceramic bezel. Zenith has gotten around this problem partly by using low-inertia silicon for the escape wheel, but a lot of the mitigation comes from customization of the driving and coupling wheels, each of which has a unique profile for the gear teeth. ![]() The amount of energy available is even less than at the fourth wheel, and adding the load of driving the chronograph is potentially even more problematic. The problem is even worse if you try to drive the chronograph off the escape wheel. Balance amplitude can drop significantly when a chronograph is switched on, and if the watch isn't in optimum condition, accuracy can suffer if you leave the chronograph on for long enough. Driving a chronograph from the fourth wheel is already kind of pushing it it's the last conventional wheel in the going train, and stealing energy from the gears at that point means less energy is available to reach the balance. One thing is certain, this timepiece will not leave lovers of precious watchmaking indifferent.The reason you don't usually see chronographs driven by the escape wheel is that, generally, it's a terrible idea to try. Each of the counters is graduated up to 60 for an intuitive and instantaneous reading of the chronograph. ![]() Its matt white dial bears the El Primero signature and its counters are similar to those of the 1969 Ref.A386: blue, anthracite and light grey. Housed in an elegant and robust 41 mm pink gold case, this chronograph is equipped with piston-type pushers and a polished black ceramic bezel engraved with a scale graduated in tenths of a second. Worthy heir to the Chronomaster lineage, this Chronomaster Sport version 2021 is equipped with a refined dial and a superb brown leather strap. This new El Primero calibre, christened 3600, offers a generous power reserve of 60 hours, a feat with such a fast heart! You will be able to admire the architecture of this marvel as well as its blue column wheel and openworked rotor marked with the five-pointed star through its sapphire caseback. ![]() Zenith has built on the foundations of the El Primero calibre and five decades of studies and improvements to the El Primero and high-frequency chronographs to offer us here, for the first time, a display accurate to 1/10th of a second from the 5 Hz escapement (36'600 a/h) in direct reading on its ceramic bezel. Once again pushing back the limits of precision in the field of high frequency, this Chronomaster Sport with its prestigious materials represents the best of Zenith's manufacturing expertise. 18.3100.3600/69.C920 marks the beginning of a new era for Zenith, which here once again reinvents the sport-chic chronograph, its signature model.
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