IWC Portugieser Perpetual Calendar 44 Tamara Comolli 5 mm (largest drop) 5 mm (largest drop) The IWC Big Pilot's Watch 43 TOP GUN (IW329801) is a powerful pilot's watch with a black ceramic case and a titanium case back Crafted from 18k 5N red gold The automatic IWC caliber 52615 provides a 7 day power reserve