This limited-edition Hublot Spirit of Big Bang,150 of 250 Made features a skeleton dial with three chronograph sub dials and a date wheel around its circumference, as well as an incredible transparent sapphire crystal tonneau-shaped case and a clear resin strap. The see-through nature of this piece wouldn’t be complete without an open caseback, of course—take a peek at the in-house HUB4700 self-winding calibre, which boasts a 50-hour power reserve.