IWC
IWC Portugieser Perpetual Calendar 44 IW503703
The IWC Portugieser Perpetual Calendar 44 (reference IW503703) is a 44.4 mm 18k white gold watch with a ice blue dial. It runs on the automatic caliber 52616 with a 168-hour power reserve and is water resistant to 50 m. It was introduced in 2024 and is still in production.
Specifications
Case
- Reference
- IW503703
- Collection
- Portugieser
- Case size
- 44.4 mm
- Thickness
- 14.9 mm
- Case material
- 18k white gold
- Case shape
- Round
- Crystal
- Sapphire
- Water resistance
- 50 m
- Bracelet / strap
- Leather strap
Dial and bezel
- Dial
- Ice blue
Movement
- Movement
- Automatic
- Caliber
- 52616
- Power reserve
- 168 hours
- Frequency
- 28,800 vph
- Functions
- Perpetual calendar, Moon phase, Power reserve indicator, Small seconds
Production
- Production
- 2024 – today (current)
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 |
|---|---|---|---|---|---|
| IW503703 (This watch) | 44.4 mm | 18k white gold | Ice blue | 52616 | 2024– |
| 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– |
| IW358313 | 40.4 mm | Stainless steel | Salmon | 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– |
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 IW503703?
- The IWC Portugieser Perpetual Calendar 44 IW503703 has a 44.4 mm case, 14.9 mm thick.
- What movement does the IWC Portugieser Perpetual Calendar 44 IW503703 use?
- It uses the automatic caliber 52616, with a 168-hour power reserve.
- How water resistant is the IWC Portugieser Perpetual Calendar 44 IW503703?
- It is water resistant to 50 metres.
- Is the IWC Portugieser Perpetual Calendar 44 IW503703 still in production?
- Yes, it is a current reference.
- When did the IWC Portugieser Perpetual Calendar 44 IW503703 come out?
- It was introduced in 2024.
- What is the IWC Portugieser Perpetual Calendar 44 IW503703 made of?
- The case is 18k white gold. Bracelet or strap: Leather strap.
Catalog facts checked September 2026.