Look at it carefully! Here before you is the most famous movement in watchmaking history, the one that every enthusiast around the world is capable of naming. It is currently the world’s most accurate series-produced movement. Its secret lies in the cadence of its balance. While the others generally perform 8 vibrations per second at best, the El Primero calibre beats 10 times in that same second. Its development has been accompanied by a number of breakthrough innovations, including dry lubrication that ensures excellent long-term stability, and the power reserve that had to be optimised to match the higher and more energy-consuming frequency. All Zenith watches are equipped with a proprietary Zenith movement.
http://www.worldtempus.com/en/news/top-news/detail/article/1275471058-zenith-el-primero-saga/

Impressive figures
9 months of work
20 watchmakers
5,500 operations
50 milling operations on the dial side
77 other milling operations on the bridge side
5 to 50 operations per component
18 different metals in the classic version.

That's awesome. 9 months to create a Zenith. Piece of art and engineering. WOW.