IWC Schaffhausen Portugieser Perpetual Calendar

The IWC Portugieser Perpetual Calendar, reference IW503301, has a 44.2 mm case in white gold. The watch has a perpetual calendar; case thickness is 14.9 mm. Calibre 52610 is self-winding and has a 168-hour power reserve and 54 jewels. Arched-edge sapphire glass covers the grey dial with a day and date display, small hacking seconds, a power reserve indicator and a moon phase display. A black alligator leather strap by Santoni is on the watch. Water resistance is rated to 30 metres. The movement's operating frequency is 28,800 vibrations per hour.