Georges Favre-Jacot established Zenith in 1865 with a groundbreaking idea to house all of the watchmaking processes under one roof. Of course, the most significant mark that Zenith has made in the history books of horology remains the advent of the integrated self-winding chronograph with the introduction of the El Primero, in 1969. Today Zenith continues to innovate, with watches such as the Defy Lab and the Defy El Primero 21 (with a chronograph function that has its own dedicated escapement with an outrageous frequency rating of 50Hz, therefore allowing it to measure time accurately to 1/100th of a second), alongside some of the most beautiful revival pieces in the business.