IWC Schaffhausen Portugieser Annual Calendar

The IWC Portugieser Annual Calendar, reference IW503510, has a 44.2 mm steel case. The watch has an annual calendar; case thickness is 14.9 mm. Self-winding calibre 52850 has a 168-hour power reserve and 36 jewels. The green dial has a day and date display, small hacking seconds and a power reserve indicator. A black alligator leather strap is on the watch. Water resistance is rated to 30 metres. A see-through case back displays the movement. The crystal is made from sapphire, with arched edges and antireflective coating on both sides.