IWC
IWC Portugieser Perpetual Calendar 44 IW503704
The IWC Portugieser Perpetual Calendar 44 (reference IW503704) is a 44.4 mm 18k white gold watch with a dune dial. It runs on the automatic caliber 52616 with a 168-hour power reserve and is water resistant to 50 m.
Specifications
Case
- Reference
- IW503704
- Collection
- Portugieser
- Case size
- 44.4 mm
- Thickness
- 15 mm
- Case material
- 18k white gold
- Case shape
- Round
- Crystal
- Sapphire
- Water resistance
- 50 m
- Bracelet / strap
- Leather strap
Dial and bezel
- Dial
- Dune
Movement
- Movement
- Automatic
- Caliber
- 52616
- Power reserve
- 168 hours
- Frequency
- 28,800 vph
- Jewels
- 54
- Functions
- Perpetual calendar, Moon phase, Power reserve indicator
Production
- Production
- Current
Dial versions
This reference was made with these dials and finishes.
IW503704 Dune
Dune
How it compares within the Portugieser family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| IW503704 (This watch) | 44.4 mm | 18k white gold | Dune | 52616 | — |
| IW358304 | 40.4 mm | Stainless steel | Silver (blue hands) | 82200 | 2020– |
| IW358305 | 40.4 mm | Stainless steel | Blue | 82200 | 2020– |
| IW358310 | 40.4 mm | Stainless steel | Green | 82200 | 2020– |
| IW371604 | 41 mm | Stainless steel | Silver (gold-plated hands) | 69355 | 2020– |
| IW371606 | 41 mm | Stainless steel | Blue | 69355 | 2020– |
| IW371615 | 41 mm | Stainless steel | Green | 69355 | 2020– |
| IW371617 | 41 mm | Stainless steel | Silver (blue hands) | 69355 | 2020– |
| IW503703 | 44.4 mm | 18k white gold | Ice blue | 52616 | 2024– |
About the Portugieser family
The Portugieser began in the late 1930s, when two Portuguese merchants asked IWC for a wristwatch as precise as a marine chronometer. IWC fitted a pocket-watch movement into a large wristwatch case, which gave the line its size and its clean, railway-track dial.
The modern family includes the Portugieser Chronograph, first introduced in the 1990s and updated in 2020, the Portugieser Automatic with a seven-day power reserve, perpetual calendars, minute repeaters and tourbillons. Calibers in the catalog include the 52010 and 51011. Dealers identify the generation and metal from the reference and check the dial, strap and papers.
Quick answers
- What size is the IWC Portugieser Perpetual Calendar 44 IW503704?
- The IWC Portugieser Perpetual Calendar 44 IW503704 has a 44.4 mm case, 15 mm thick.
- What movement does the IWC Portugieser Perpetual Calendar 44 IW503704 use?
- It uses the automatic caliber 52616, with a 168-hour power reserve.
- How water resistant is the IWC Portugieser Perpetual Calendar 44 IW503704?
- It is water resistant to 50 metres.
- Is the IWC Portugieser Perpetual Calendar 44 IW503704 still in production?
- Yes, it is a current reference.
- What is the IWC Portugieser Perpetual Calendar 44 IW503704 made of?
- The case is 18k white gold. Bracelet or strap: Leather strap.
Catalog facts checked October 2026.