The short answer: if you want a Portofino in a 39mm case, buy genuine and buy pre-owned. Listings marketed as a faux Portofino 39 look tempting on price, but they cannot be serviced by an authorized watchmaker, they carry no warranty, they can be seized by U.S. Customs on import, and they resell for almost nothing. A real Portofino in clean pre-owned condition costs more on day one and keeps much of its value, which usually makes it the cheaper watch to own over ten years.
What to look for in a 39mm Portofino
IWC has moved the Portofino line between roughly 37mm, 39mm, and 40mm cases across generations, so confirm the diameter with calipers or at a dealer rather than trusting a listing title. Chronograph versions wear larger than the number suggests because of the pushers and the thicker mid-case. Match the case to your wrist and to the straps you already own before you commit.
- Case: stainless steel (gold and two-tone versions exist), 39mm diameter, about 9.5mm thick on the automatic and closer to 13.5mm on the chronograph, with 20mm lugs on most references.
- Movement: the 35100-series automatic in the three-hand models and the 79320-family chronograph in the chrono. Both sit on well-known Swiss base calibres, which is good news for long-term serviceability.
- Crystal: sapphire, with anti-reflective coating on many versions. Hairline scratches are rare, chips at the edge are not.
- Water resistance: 3 bar (30m). This is a dress watch. It handles rain and hand washing, nothing more.
- Dial and hands: applied indices, feuille or baton hands, Roman numerals at 12 and 6 on several dials. Printing and markers should be crisp under 10x magnification.
- Papers: box, warranty card, and service receipts. A documented service in the last five years is worth more than a low asking price.
Sensible parameter bands
Use these ranges as a filter when you shop:
- Diameter 38.5mm to 39.5mm if the listing claims a 39mm case.
- Thickness under 10mm for the automatic, 13mm to 14mm for the chronograph.
- Lug width 20mm, which keeps strap choices broad and inexpensive.
- Power reserve near 42 hours for the automatic and 44 hours for the chronograph when fully wound.
- Timekeeping within about -5 to +10 seconds a day on a recently serviced example.
- Case condition: sharp lugs with original bevels. Heavy polishing rounds them off and points to a hard life.
Pitfalls to avoid
- Counterfeit listings. Beyond the legal exposure for trafficking in counterfeit goods, a fake cannot be repaired by IWC or by most independent watchmakers, and its parts do not interchange with the real model.
- Wrong proportions. Thin, slab-sided cases with printed rather than applied markers are the usual giveaway when a listing claims 39mm.
- Water damage sold as patina. A 30m watch that has been swimming will show corrosion around the crown tube and gasket.
- Aftermarket dials and hands presented as original. Ask for a movement photo and a serial check before paying.
- Ignoring service costs. A full chronograph service is a genuine expense, so factor it into any offer you make.
FAQ
Is a 39mm Portofino too small for a 7 inch wrist?
No. A 39mm dress watch is a classic size and reads well on wrists from about 6.5 to 7.5 inches, particularly with a 20mm strap.
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Can I swim with it?
Not recommended. The Portofino is rated to 3 bar, which covers splashes. Take it off before you get in the water.
How often does it need service?
Every five to seven years for daily wear. If the watch starts losing time or the crown feels gritty, book it sooner rather than later.
Is a faux Portofino 39 ever a smart buy?
No. You save once and lose at resale, at the first repair, or at the border. Genuine or nothing.