IWC Portugieser Annual Calendar IW503501

The IWC Portugieser Annual Calendar IW503501 (introduced 2015) is the watch that made the annual calendar complication accessible and instantly recognizable. Housed in a polished 44.2 mm stainless steel case (just 14.9 mm thick), this reference combines classic Portugieser proportions with one of the cleanest triple-window annual calendar displays in horology: date at 12, day at 9, and month at 3 — plus a practical week-number indicator and small seconds at 6 o’clock.

The silver-plated dial with feuille hands and applied Arabic numerals delivers perfect legibility and timeless elegance, while the in-house Calibre 52850 automatic movement (36 jewels, 4 Hz) powers it all with a massive 7-day (168-hour) power reserve thanks to twin barrels and IWC’s signature Pellaton winding system with ceramic components. A sapphire caseback reveals the beautifully decorated movement and gold-plated rotor.

Delivered on a black Santoni alligator strap with stainless steel folding clasp, the IW503501 is equally at home with a suit or weekend attire. Although succeeded by newer models, this original steel reference remains one of the most beloved modern Portugiesers

Key Features of the IWC Portugieser Annual Calendar IW503501:

• In-House Calibre 52850: 7-day power reserve, Pellaton winding with ceramic parts, and highly accurate annual calendar (requires correction only once per year — on March 1).
• Triple-Window Annual Calendar: Date, day, month, and week-number displayed in perfect symmetry — no sub-dials needed.
• Classic 44.2 mm Portugieser Design: Silver dial, feuille hands, applied numerals, and exhibition caseback for pure dress-watch refinement.