IWC
IWC Portofino Chronograph Edition "150 Years" IW391023
The IWC Portofino Chronograph Edition "150 Years" (reference IW391023) is a 42 mm stainless steel watch with a blue dial. It runs on the automatic caliber 79320 with a 44-hour power reserve and is water resistant to 30 m. It is no longer in production.
Specifications
Case
- Reference
- IW391023
- 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
- Leather strap
Dial and bezel
- Dial
- Blue
Movement
- Movement
- Automatic
- Caliber
- 79320
- Power reserve
- 44 hours
- Frequency
- 28,800 vph
- Jewels
- 25
- Functions
- Chronograph, Day-date
Production
- Production
- Discontinued
Dial versions
This reference was made with these dials and finishes.
IW391023 Blue
Lacquered
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 |
|---|---|---|---|---|---|
| IW391023 (This watch) | 42 mm | Stainless steel | Blue | 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 Edition "150 Years" IW391023?
- The IWC Portofino Chronograph Edition "150 Years" IW391023 has a 42 mm case, 13.6 mm thick.
- What movement does the IWC Portofino Chronograph Edition "150 Years" IW391023 use?
- It uses the automatic caliber 79320, with a 44-hour power reserve.
- How water resistant is the IWC Portofino Chronograph Edition "150 Years" IW391023?
- It is water resistant to 30 metres.
- Is the IWC Portofino Chronograph Edition "150 Years" IW391023 still in production?
- Discontinued.
- What is the IWC Portofino Chronograph Edition "150 Years" IW391023 made of?
- The case is stainless steel. Bracelet or strap: Leather strap.
Catalog facts checked October 2026.