Pues te pongo un texto que he encontrado por la red. que lo traduzca cada uno, no vaya yo a decir alguna burrada.
The movement is an El Primero Cal. 4052 automatic. It has 334 components, 31 jewels, a 50-hour maximum power reserve and runs at 5Hz. Visible through the sapphire caseback is a skeletonized oscillating weight, finished with a “Côtes de Genève” pattern. Zenith maintained the double chronograph wheel in silicon, while adding a lever and an escape-wheel made from the same high-tech, light, antimagnetic material that is harder than steel and guarantees excellent efficiency. Additionally, to further reduce the weight of the movement, they utilized titanium components for the: mainplate, barrel bridge, balance bridge, chronograph bridge, pallet bridge and pallet-wheel bridge. The result is a movement that is one-quarter lighter, or just 15.45 grams (compared to 21.10 grams for a similar classic movement with a mainplate and bridges in brass).
Por cierto, siempre me entusiasmó el Retrotimer, aunque mas el modelo de acero. Lastima que lo descatalogaran.