IWC
IWC Portofino Automatic Moon Phase IW459403
The IWC Portofino Automatic Moon Phase (reference IW459403) is a 40 mm 18k 5N gold watch with a silver dial. It runs on the automatic caliber 35800 with a 50-hour power reserve and is water resistant to 30 m.
Specifications
Case
- Reference
- IW459403
- Collection
- Portofino
- Case size
- 40 mm
- Thickness
- 11.1 mm
- Case material
- 18k 5N gold
- Case shape
- Round
- Crystal
- Sapphire
- Water resistance
- 30 m
- Bracelet / strap
- Leather strap
Dial and bezel
- Dial
- Silver
Movement
- Movement
- Automatic
- Caliber
- 35800
- Power reserve
- 50 hours
- Frequency
- 28,800 vph
- Jewels
- 25
- Functions
- Moon phase
Production
- Production
- Current
Dial versions
This reference was made with these dials and finishes.
IW459403 Silver
Silver-plated dial
How it compares within the Portofino family
Side by side with other references in the same collection, from the catalog.
| Reference | Size | Material | Dial | Caliber | Years |
|---|---|---|---|---|---|
| IW459403 (This watch) | 40 mm | 18k 5N gold | Silver | 35800 | — |
| IW356501 | 40 mm | Stainless steel | Silver | 35111 | 2011– |
| IW356502 | 40 mm | Stainless steel | Black | 35111 | 2011– |
| IW356505 | 40 mm | Stainless steel | Silver | 35111 | 2011– |
| IW356527 | 40 mm | Stainless steel | Silver | 35111 | — |
| IW391029 | 42 mm | Stainless steel | Black | 79320 | — |
| IW458601 | 37 mm | Stainless steel | Silver | 32111 | — |
| IW459401 | 40 mm | Stainless steel | Silver | 35800 | — |
| IW510107 | 45 mm | 18k 5N gold | Silver | 59210 | — |
About the Portofino family
The Portofino was introduced in 1984 as IWC's round dress watch, named after the Italian harbour town. Its simple dial, slim bezel and classic case made it the brand's most understated line.
The catalog includes automatic time-and-date models, chronographs, moon phases and eight-day models, with calibers such as 35111 and 59210, in stainless steel, 18k 5N gold and 18k white gold. Dealers identify the size and function from the reference and check the strap or Milanese bracelet.
Quick answers
- What size is the IWC Portofino Automatic Moon Phase IW459403?
- The IWC Portofino Automatic Moon Phase IW459403 has a 40 mm case, 11.1 mm thick.
- What movement does the IWC Portofino Automatic Moon Phase IW459403 use?
- It uses the automatic caliber 35800, with a 50-hour power reserve.
- How water resistant is the IWC Portofino Automatic Moon Phase IW459403?
- It is water resistant to 30 metres.
- Is the IWC Portofino Automatic Moon Phase IW459403 still in production?
- Yes, it is a current reference.
- What is the IWC Portofino Automatic Moon Phase IW459403 made of?
- The case is 18k 5N gold. Bracelet or strap: Leather strap.
Catalog facts checked October 2026.