Hublot Spirit of Big Bang Titanium Rainbow 42 mm Transparent Dial with Diamonds Polished Titanium Alligator Leather Strap 642.NX.0117.LR.0999

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.