IWC Portugieser IW390502 43.5 mm Silver Dial

IW390502 shifts the Portugieser flyback chronograph toward a more relaxed, sporting expression. Its 43.5 mm stainless-steel case surrounds a silver dial, while the black rubber strap changes the way the watch meets the wrist without diluting the collection's clear, open design. A see-through back keeps the movement in view, and the 60-metre water resistance supports the more versatile configuration.

The watch is powered by calibre 89361, an in-house automatic chronograph with flyback function, small seconds and date display. The 30 mm movement is 7.5 mm high and contains 299 components with 38 jewels. Its single barrel stores 68 hours of power reserve at a 4 Hz frequency. At 14.1 mm thick, the case gives this substantial complication a confident physical presence.