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What is the IWC Portugieser Annual Calendar?
IW503504 is the exact reference number for the configuration on IWC’s official product page, which classifies it as part of past collections. The page identifies a silver dial, 18 ct 5N gold case and black alligator-leather strap.
The annual calendar uses three separate windows to display month, date and day. IWC says the complication debuted in the Portugieser in 2015; that is the debut of the complication, not a production-date claim for every IW503504 configuration. IWC’s history of the annual calendar describes the three semicircular displays at 12 o’clock and the annual February correction.
How often does the calendar need to be adjusted?
Once a year, at the end of February. The mechanism handles the varying lengths of the other months, but it does not account for February’s variable length or leap years. Correct the calendar manually via the crown at February’s end, following the watch’s operating instructions.
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- The Alpiner Extreme Automatic is now available in a titanium 39 x 40.5mm unisex size. At the heart of the design, a strong brushed and polished titanium cushion case featuring a white dial with triangle pattern, and a light grey outer ring with white markers and applied silver indexes filled with white luminous treatment.
- Date window at 3 o'clock. Hand-polished silver tone hour and minute hands also filled with white luminous treatment.
- Polished silver tone second hand with signature Alpina red triangle.
- Set on a brushed and polished titanium bracelet with folding buckle and housing the AL-525 caliber automatic movement, this timepiece is water resistant to 200M.
Movement and specifications
IWC lists an automatic, IWC-manufactured caliber 52850 with a 168-hour (seven-day) power reserve. The official Reference 5035 manual describes the automatic Pellaton winding system.
| Specification | IWC-listed detail |
|---|---|
| Reference and collection status | IW503504; past collections on IWC’s product page |
| Case and dial | 18 ct 5N gold; silver dial |
| Strap | Black alligator leather |
| Case diameter and height | 44.2 mm; 14.9 mm |
| Strap and buckle width | 22 mm; 18 mm |
| Movement and reserve | Automatic IWC-manufactured caliber 52850; 168 hours |
| Frequency | 28,800 vibrations per hour (4 Hz) |
| Calendar | Month, date and day; manual correction at February’s end |
| Water resistance | 3 bar |
| Crystal and caseback | Arched-edge sapphire crystal with anti-reflective coating on both sides; sapphire display back |
These are specifications for the listed reference, not a guarantee about the condition or configuration of any individual watch. The 22 mm strap and 18 mm buckle widths are measurements, not proof that every aftermarket strap or buckle will fit.
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Annual calendar versus perpetual calendar
An annual calendar and a perpetual calendar differ in what the mechanism accounts for. IW503504 requires a manual February correction each year. For comparison, IWC’s Portugieser Perpetual Calendar 42, reference IW344202, lists displays for date, day, month, leap year and moon phase. Its listed case diameter is 42.4 mm, compared with 44.2 mm for IW503504.
| Consideration | Annual Calendar IW503504 | Perpetual Calendar 42 IW344202 |
|---|---|---|
| Calendar correction | Manual correction at the end of February each year | Different complication; consult the exact reference’s manual for operating details |
| Displayed information | Month, date and day | Date, day, month, leap year and moon phase |
| Listed case diameter | 44.2 mm | 42.4 mm |
Choose based on the calendar information and correction routine you want, as well as the particular reference’s dimensions. Diameter alone does not establish how a watch will fit; thickness, lug geometry and a try-on matter too.
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What to check when considering IW503504
- Confirm that the watch is reference IW503504 and that its case material, dial and strap match the configuration being represented.
- Assess the specific watch’s condition and the function of its calendar; the reference specifications do not describe the condition of an individual example.
- Try the 44.2 mm case on if possible and consider its 14.9 mm height alongside diameter.
- Do not treat IWC’s past-collection designation as proof of current availability or a particular price. The product page does not establish live inventory or market value.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
