IWC Portofino Lug Width
| Reference Number | Model | Lug Width |
| IW2010/IW3331 | Portofino Ultra Thin | 18mm |
| IW3446 | Portofino Perpetual Cal. | 20mm |
| IW3513/IW3514 | Portofino Automatic | 18mm |
| IW3533 | Portofino Automatic | 20mm |
| IW3550 | Portofino Moonphase | 18mm |
| IW3563 | Portofino Automatic | 20mm |
| IW3564/IW3574 | Portofino Midsize | 16mm |
| IW3565 | Portofino Automatic | 20mm |
| IW3590 | Portofino Comp. Calendar | 20mm |
| IW3592 | Portofino Pointer Date | 18mm |
| IW3724 | Chronograph MecaQuartz | 20mm |
| IW3730 | Portofino Chronograph | 16mm |
| IW3731 | Portofino Chronograph | 18mm |
| IW3783/IW3910/IW3914 | Portofino Chronograph | 20mm |
| IW458X/IW4590/IW4591 | Portofino 37mm | 18mm |
| IW4594 | Portofino 40mm | 20mm |
| IW4598 | Portofino 34mm | 16mm |
| IW5101/IW5111/IW5151 | Portofino 45mm | 22mm |
| IW5161/IW5162/IW5164 | Portofino Big Date | 22mm |
| IW6586 | Portofino 37mm | 18mm |
