IWC
IWC Portofino Chronograph IW391028
The IWC Portofino Chronograph (reference IW391028) is a 42 mm stainless steel watch with a silver dial. It runs on the automatic caliber 79320 with a 44-hour power reserve and is water resistant to 30 m.
Specifications
Case
- Reference
- IW391028
- Collection
- Portofino
- Case size
- 42 mm
- Thickness
- 13.6 mm
- Case material
- Stainless steel
- Case shape
- Round
- Crystal
- Sapphire
- Water resistance
- 30 m
- Bracelet / strap
- Stainless steel
Dial and bezel
- Dial
- Silver
Movement
- Movement
- Automatic
- Caliber
- 79320
- Power reserve
- 44 hours
- Frequency
- 28,800 vph
- Jewels
- 25
- Functions
- Chronograph, Day-date
Production
- Production
- Current
Dial versions
This reference was made with these dials and finishes.
IW391028 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 |
|---|---|---|---|---|---|
| IW391028 (This watch) | 42 mm | Stainless steel | Silver | 79320 | — |
| 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 Chronograph IW391028?
- The IWC Portofino Chronograph IW391028 has a 42 mm case, 13.6 mm thick.
- What movement does the IWC Portofino Chronograph IW391028 use?
- It uses the automatic caliber 79320, with a 44-hour power reserve.
- How water resistant is the IWC Portofino Chronograph IW391028?
- It is water resistant to 30 metres.
- Is the IWC Portofino Chronograph IW391028 still in production?
- Yes, it is a current reference.
- What is the IWC Portofino Chronograph IW391028 made of?
- The case is stainless steel. Bracelet or strap: Stainless steel.
Catalog facts checked October 2026.