The IW371610 reference places this replica Portuguese IW371610 firmly in the Portugieser Chronograph lineage, a series that has been central to the Schaffhausen manufacturer’s catalog for decades. This particular variant features a deep blue sunburst dial combined with silver-toned subdials, creating a contrast combination that reads differently under natural and artificial light. The 41mm steel case maintains the proportions that made the Portugieser chronograph one of the most recognized dress chronographs in production. Slim lugs and a narrow bezel let the dial dominate the visual footprint on the wrist.

Technical Overview

• Case diameter: 41mm
• Case material: stainless steel
• Dial: blue sunburst with applied indices
• Subdials: 30-minute counter at 12, small seconds at 6
• Crystal: domed sapphire with anti-reflective treatment
• Functions: chronograph, small seconds
• Strap: blue alligator leather, pin buckle

The sunburst finishing on the blue dial shifts between navy and a lighter blue depending on the angle, adding depth that flat-finished dials cannot match. IWC’s applied indices are polished and slightly raised, catching ambient light at the edges.

Inside the Movement

Portugieser chronographs have traditionally relied on column-wheel chronograph calibers, and this reference follows that lineage with an automatic chronograph movement. Start-stop-reset action should feel crisp, with the chronograph seconds hand returning to twelve without bounce. The power reserve sits in the practical range for daily wear. For a comparison against a non-chronograph Portuguese automatic, the Automatic Blue Dial IW500710 strips away timing complications in favor of a cleaner dial layout. Both live within the Portuguese lineup but address different priorities.

What Sets It Apart

The IW371610 sits at the intersection of dress watch and functional chronograph. Its blue dial gives it more visual personality than the traditional silver Portugieser chronographs, while the 41mm case keeps it wearable in formal settings where a 43mm or 44mm case would feel too assertive. The balance between color and restraint is what defines this reference. This replica Portuguese IW371610 delivers that balance for buyers who want a blue-dial chronograph without sacrificing the refined character of the collection.