Zenith Chronomaster Review Watches and Technology / By Timeless The Zenith Chronomaster 1969 is the simplest, and most traditional, of the Chronomasters with open hearts. Zenith Chronomaster El Primero 38mm Review . The El-Primero is possibly the most iconic chronograph movement and a very significant one at that. Why you ask? Read our full review to find out. Replica Zenith Chronomaster El Primero 38mm Full Review. My first impression is that the 38mm mm Zenith El Primero wears and looks like a larger watch when on the wrist. Zenith has been in the process of updating the Chronomaster collection, getting it as close to the original source material as possible, while listening to collectors – addressing subtle details like dial text, date window placement, and the size of the sub-dial overlap . Angus Davies reviews the Zenith Chronomaster El Primero 42mm. The Zenith Chronomaster El Primero 42mm in 18-carat rose gold is a new addition to the impressive collection of chronograph models from this historical watch brand. The El Primero calibre, unveiled in 1969, was one of the first, if not the first, self-winding chronograph movements. The Zenith El Primero Chronomaster 38mm is a faithful reproduction of one of the great classic chronographs of all time. I imagine many people out there have a soft spot for the Zenith El Primero. Flipping over a modern watch with this movement inside takes you back to an earlier time.