The Frederique Constant Slimline Heart Beat Automatic FC-312B4S6 is a men's watch featuring a 40 mm stainless steel case with a thickness of 8.3 mm. It has a black dial with silver-tone hands and index hour markers, protected by a scratch-resistant sapphire crystal. The watch is powered by the automatic FC-312 movement, offering a 42-hour power reserve. It includes an open balance wheel at the 12 o'clock position, known as the Heart Beat aperture. The timepiece is complemented by a black calfskin leather strap with a pin buckle clasp. Water resistance is rated at 30 meters. Reference number: FC-312B4S6.