Spirit of Big Bang Sky Blue CeramicThe HUB4700 caliber is the successor to the famous El Primero caliber the first chronograph with an integrated style automatic winding (1969), which was also the first mechanical chronograph equipped with a 5 Hz frequency (36000 alt h) allowing an accuracy of 1 10th of a second. In a perfect fusion between tradition and innovation, this entirely skeletonized movement is now equipped with silicon regulating element ensuring avant garde performances,