The IW500705 reference positions this replica Portuguese IW500705 in the 42.3mm tier of the Portugieser Automatic range, slightly different in dimension from the 42.4mm 501xxx references that surround it in the catalog. Built by IWC, This fractional size difference reflects a different generation of Portugieser case tooling, placing the IW500705 in the transitional period between the older and current Portuguese automatic platforms. The dial carries the familiar Arabic numerals and railway minute track, maintaining visual continuity with both its predecessors and successors in the line.

Technical Overview

• Case diameter: 42.3mm
• Case material: stainless steel
• Dial: Arabic numerals, subsidiary seconds, power reserve display
• Power reserve: 7-day architecture
• Crystal: domed sapphire
• Caseback: exhibition with sapphire window
• Functions: hours, minutes, small seconds, power reserve indicator

The 0.1mm case difference between 42.3mm and 42.4mm is imperceptible on the wrist, but it signals a different production generation. The IW500705 shares its movement platform concept with the newer 501xxx series, both targeting the seven-day reserve specification.

Inside the Movement

The genuine IW500705 houses the Caliber 51011, the predecessor to the Caliber 52010 found in newer references. Both use the Pellaton winding system and double-barrel architecture for the seven-day power reserve, but the 52010 introduced ceramic winding components for reduced friction. The 51011 remains a proven and robust caliber that served as the backbone of the Portugieser Automatic line for several years. To see how the Portuguese chronograph complication compares to this time-only automatic, check the Portuguese Silver IW371620 chronograph. Both belong to the Portuguese collection but address very different functional needs.

What Sets It Apart

The IW500705 occupies an interesting position as a bridge reference between older and newer Portugieser Automatic generations. Its 42.3mm case and Caliber 51011 movement represent the proven platform that established the seven-day power reserve as a core Portugieser feature before the updated 52010 series took over. For collectors and enthusiasts who appreciate transitional references with proven mechanical foundations, this model carries historical relevance within the Portugieser timeline. This replica Portuguese IW500705 captures that transitional generation for anyone interested in the evolution of the seven-day automatic platform.