A perfect fusion between tradition and innovation in an entirely skeletonized design Movements HUB4700The 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, precision and reliability.Materials KING GOLDAs a master of fusion and an alchemist of precious metals, Hublot has developed a new gold color with a warmer shade than the traditional 5N 18K gold. Containing mainly platinum, this exclusive King Gold alloy perfectly lends itself to all elements of polishing and satin finishing. Hublot watches blend the most unexpected materials like high-tech ceramic, rubber and carbon.