Editorial
The Portofino Chronograph 42mm is IWC's attempt to bring stopwatch function into a slim, formal package without the bulk that usually comes with it. It succeeds visually: the dial is clean, the case proportions sit closer to a dress watch than a sport chrono, and the sunburst silver dial reads well at dinner. Collectors treat it as a capable daily wearer that covers more ground than a pure dress piece, without demanding the premium of IWC's in-house movements.
IWC introduced the current 42mm Portofino Chronograph in 2014, housed in reference IW391036, a steel case with a silver dial, small seconds at 9 o'clock, and date at 3. The movement is the Valjoux 7750 (caliber 79320 in IWC's designation), a proven Swiss ebauche that IWC did not develop and does not pretend otherwise. The 7750 base means the pusher architecture and layout are shared with countless other chronographs, which is a known trade-off for a brand in this tier.
IWC has offered the Portofino Chrono in several case metals and dial colors over the years, including rose gold and blue dial variants that carry a significant premium. The steel silver-dial IW391036 has remained the entry point and the most available reference throughout the production run.
Inspect the pushers carefully: the 7750 is robust but chronograph column-wheel wear shows up in soft or inconsistent pusher feel, and replacement parts are inexpensive but labor is not. Dial condition is everything on the silver sunburst version; moisture ingress or storage under UV creates patchy fading that is irreversible without a full redial, which destroys originality and value. Check the case edges for polishing, since sellers often buff the lugs on returned or worn pieces, rounding what should be crisp transitions between the polished and brushed surfaces.
Confirm the reference number against the movement: the 79320 should be present on the rotor; a swapped or undisclosed service movement is occasionally seen on grey-market pieces. Bracelet stretch on examples sold on the original strap is not a concern, but buyers receiving a bracelet should check clasp play, as aftermarket bracelets are common on this reference.
