The IWC Portugieser Perpetual Calendar IW503401 features a 44.2mm 18ct white gold case with midnight blue dial and Arabic numerals. Powered by the in-house Caliber 52615 automatic movement with Pellaton winding system, offering an impressive 168-hour (7-day) power reserve. The movement comprises 386 parts and 54 jewels with Côtes de Genève and perlage finishing. Perpetual calendar displays date, day, month, and 4-digit year, along with perpetual double moon phase for northern and southern hemispheres. Power reserve indicator and small hacking seconds. Arched-edge sapphire crystal with antireflective coating on both sides and see-through sapphire caseback. Alligator leather strap with white gold deployant clasp.