Chronoswiss Watch Flying Grand Regulator Skeleton CH-6723S-BLSI. Chronoswiss concentrates on the essentials for the new Flying Grand Regulator Skeleton. With its barely existent dial and a skeletonised movement, the stunning timepiece is thus freed from all superfluous material in an innovative manner. The result is a multidimensional Regulator watch with an elaborately constructed dial and deep insights.