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.

This timepiece has undergone a thorough inspection of water resistance, accuracy, functionality and condition to determine the level of reconditioning required to meet our strict standards. It has also been referenced against technical documents and manufacturer records where available to ensure authenticity and a clean history.

Topwatch 12 Month Warranty Included.

Orders are dispatched from Topwatch during normal South African business hours, which are 08:00 to 17:00.

For our customers, we only accept the lowest cost and safest delivery procedures possible. All packages shipped via Topwatch are fully insured against loss, theft & damage during transit at no extra cost to you.

Due to the valuable nature of Topwatch products, we require a signature from an authorised person for your delivery at your nominated delivery address. Products will be deemed received by you, if accepted by a person at your nominated delivery address.

Insurance applies until the order is delivered to your nominated address. Delivery details must include a daytime contact telephone number. *Post Office boxes cannot be used for deliveries by our Couriers.

Overseas deliveries may be subject to import charges and other local taxes. Any such charges are the responsibility of the customer. Customs restrictions may also apply.