IWC
IWC Portofino Automatic 37 IW458103
The IWC Portofino Automatic 37 (reference IW458103) is a 37 mm stainless steel watch with a silver (diamond indexes) dial. It runs on the automatic caliber 35111 with a 42-hour power reserve and is water resistant to 30 m.
Specifications
Case
- Reference
- IW458103
- Collection
- Portofino
- Case size
- 37 mm
- Thickness
- 9 mm
- Case material
- Stainless steel
- Case shape
- Round
- Crystal
- Sapphire
- Water resistance
- 30 m
Dial and bezel
- Dial
- Silver (diamond indexes)
Movement
- Movement
- Automatic
- Caliber
- 35111
- Power reserve
- 42 hours
- Frequency
- 28,800 vph
- Jewels
- 25
- Functions
- Date
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 |
|---|---|---|---|---|---|
| IW458103 (This watch) | 37 mm | Stainless steel | Silver (diamond indexes) | 35111 | — |
| 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 | — |
| IW459401 | 40 mm | Stainless steel | Silver | 35800 | — |
| IW459403 | 40 mm | 18k 5N gold | 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 37 IW458103?
- The IWC Portofino Automatic 37 IW458103 has a 37 mm case, 9 mm thick.
- What movement does the IWC Portofino Automatic 37 IW458103 use?
- It uses the automatic caliber 35111, with a 42-hour power reserve.
- How water resistant is the IWC Portofino Automatic 37 IW458103?
- It is water resistant to 30 metres.
- What is the IWC Portofino Automatic 37 IW458103 made of?
- The case is stainless steel.
Catalog facts checked September 2026.