Like an american muscle car from the 1970s, the Franck Muller Giga Gong Tourbillon (www.franckmuller.com) is engineered to produce power—excessive amounts of it—not conserve it. Indeed, energy consumption is a touted feature of the brand’s entire series of large-format Giga Tourbillons. This latest entry adds an extra demand on the watch’s four massive barrels by including a striking-hour complication, which automatically chimes every half hour. The huge power requirements of this complication and the 20 mm tourbillon can be a drain on the watch’s power reserve. Indeed, if the wearer does not deactivate the chime—using the push button located at 4 o’clock on the case—the watch’s six-day power reserve will be exhausted in just 40 hours. An indicator on the dial denotes whether the chime is turned on or off. The $375,600 Giga Gong Tourbillon is available in two case styles: round and Franck Muller’s signature Cintrée Curvex.