This replica Portofino IW459402 blue carries the moon phase complication in a 40mm stainless steel case with a deep blue sunburst dial. IWC positioned the moon phase aperture at 12 o’clock and the small seconds with integrated date at 6 o’clock, creating a balanced vertical axis that defines the IW459402’s face. The blue dial shifts between navy and midnight depending on light angle, a characteristic that photographs well and stands out against the neutral tones offered by the silver and white alternatives in the same reference family.

Case & Movement Specs

• Case diameter: 40mm
• Case material: stainless steel
• Dial: blue sunburst with applied indices
• Complications: moon phase at 12, small seconds with date at 6
• Crystal: domed sapphire with anti-reflective coating
• Water resistance: 30m
• Strap: blue alligator leather with pin buckle
• Movement: automatic

The 30-meter water resistance confirms this is a dress piece, not a sport watch. The domed sapphire adds visual depth to the dial, curving light across the blue surface in a way flat crystals cannot.

Caliber Breakdown

Inside the IW459402 sits an automatic movement that powers the time display, moon phase, and date. The moon phase disc visible through the aperture at 12 shows a realistic depiction against a dark background, which pairs visually with the blue dial beneath it. IWC’s Portofino automatic references share a movement platform, meaning the iwc portofino blue variant runs the same caliber as the silver and rose gold siblings. For a precious-metal take on the same layout, see the rose gold IW459403, or explore additional references in the Portofino collection.

How It Compares

Blue-dial dress watches have become one of the most requested configurations in recent years, and the IW459402 delivers that combination with a moon phase complication at a 40mm size. Compared to the silver IW459401, this version reads bolder on the wrist while maintaining the same slim proportions. The blue alligator strap ties into the dial color for a coordinated look that eliminates the need for strap swapping. This replica Portofino IW459402 blue remains the most visually distinctive option among the current Portofino moon phase trio.