Hublot Spirit of Big Bang Sang Bleu All Black 42 MM - Black Rubber Strap - Sapphire Crystal Dial - 648.CX.0114.RX.MXM23

The 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 (36’000 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, precision and reliability. HUB4700 Self-winding Skeleton Chronograph Movement. Black Smooth Rubber Straps. Sapphire Crystal Dial.