IWC
IWC Portugieser Eternal Calendar IW505701
The IWC Portugieser Eternal Calendar (reference IW505701) is a 44.4 mm platinum watch with a white dial. It runs on the automatic caliber 52640 with a 168-hour power reserve and is water resistant to 50 m.
Specifications
Case
- Reference
- IW505701
- Collection
- Portugieser
- Case size
- 44.4 mm
- Thickness
- 14.9 mm
- Case material
- Platinum
- Case shape
- Round
- Crystal
- Sapphire
- Water resistance
- 50 m
- Bracelet / strap
- Leather strap
Dial and bezel
- Dial
- White
Movement
- Movement
- Automatic
- Caliber
- 52640
- Power reserve
- 168 hours
- Jewels
- 54
- Functions
- Eternal calendar, Moon phase, Power reserve indicator
Production
- Production
- Current
Dial versions
This reference was made with these dials and finishes.
IW505701 White
White
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 |
|---|---|---|---|---|---|
| IW505701 (This watch) | 44.4 mm | Platinum | White | 52640 | — |
| 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 Eternal Calendar IW505701?
- The IWC Portugieser Eternal Calendar IW505701 has a 44.4 mm case, 14.9 mm thick.
- What movement does the IWC Portugieser Eternal Calendar IW505701 use?
- It uses the automatic caliber 52640, with a 168-hour power reserve.
- How water resistant is the IWC Portugieser Eternal Calendar IW505701?
- It is water resistant to 50 metres.
- Is the IWC Portugieser Eternal Calendar IW505701 still in production?
- Yes, it is a current reference.
- What is the IWC Portugieser Eternal Calendar IW505701 made of?
- The case is platinum. Bracelet or strap: Leather strap.
Catalog facts checked October 2026.