The best fake Portofino 39 for most buyers is the 39mm automatic with a decorated Japanese or Swiss automatic movement, a sapphire crystal, and a date window set level with the crown. It wins on the three criteria that decide whether a replica reads as convincing on the wrist: case proportions, dial execution, and movement reliability. Cheaper versions cut corners on exactly those points, which is why a 20 dollar difference in listing price rarely shows up as a 20 dollar difference in quality.

What "Portofino 39" points to

The Portofino is IWC's dress line: thin bezel, round polished case, leather strap, and a clean dial with Roman numerals or applied markers. The number in the search term points to case diameter, not to one single reference. A 39mm case sits below the 40mm and 42mm sizes common on sport watches, so it reads as a classic dress watch and slides under a shirt cuff.

Replicas copy the template rather than one exact reference. Two sellers can list the same "Portofino 39" and ship different dials, different date positions, and different movements. Judge the watch you are shown, not the listing title.

Criterion 1: case size and thickness

Case size is the first thing anyone notices and the hardest thing to correct after purchase. Measure across the bezel, crown excluded, and compare that number to the spec you were quoted.

Pros of a correct 39mm case

  • Fits most wrists from about 6.5 to 7.5 inches without lug overhang.
  • Slim profile slips under a cuff, which is the whole point of a dress watch.
  • Lug curve and thickness matter more for comfort than the diameter number alone.

Cons and common failures

  • Cases that run 40 to 41mm get listed as 39mm; a cheap caliper settles the question.
  • Thick cases, often 11mm and up, sit high and lose the flat dress-watch look.
  • Sharp lug edges and shallow polishing become obvious in side-lit photos.

Use case: if you wear a dress shirt most days, hold out for a thin case. If you want one watch for both office and weekend, a slightly thicker case is a fair trade for a stronger strap and better water resistance.

Criterion 2: dial, hands, and date

Dial work is where mid-range replicas separate from budget ones. Print quality, marker alignment, and hand length are visible from arm's length, so they carry more weight than an engraved caseback nobody sees.

Pros of a well-finished dial

  • Crisp printed markers with even lacquer and no bleeding at the edges.
  • Hands cut to the right length, with the seconds hand reaching the minute track.
  • Date aperture centered at 3 o'clock and aligned with the crown.

Cons you will spot on cheap builds

  • Oversized or thin fonts that change the character of the dial.
  • Markers applied off-center or at uneven heights.
  • A white date disc dropped into a dark dial, which no genuine watch would use.

Criterion 3: movement

Movement choice decides whether the watch survives daily wear or becomes a drawer ornament. Modern Japanese automatics and Swiss ETA or Sellita bases are the two families you will see named in listings.

Pros

  • Serviceable designs with widely available parts and regulated timekeeping within a few seconds a day.
  • Hacking and hand-winding on most modern bases, which makes setting the watch easy.
  • A 28,800 vph beat rate gives the smooth sweep a mechanical Portofino should have.

Cons

  • Decorated rotors and bridges are plating and engraving, not hand finishing, so expect a plain view through a display back.
  • Quartz versions tick once per second, which no Portofino does.
  • Water resistance claims past 30m are marketing on most replicas and should not be tested.

The two tiers you will meet

Tier A: upper-range automatic

Built around a reliable automatic, sapphire crystal, and a properly sized case.

  • Pros: convincing proportions, accurate dial, keeps time, serviceable.
  • Cons: highest cost of the group, longer shipping, small variations between batches.

Tier B: budget automatic or quartz

Aimed at buyers who want the look at the lowest cost.

  • Pros: low price, light on the wrist, easy to replace if damaged.
  • Cons: thick case, rough dial print, ticking seconds hand, short service life.

Which one to choose

Buy Tier A if the watch will be worn to work, photographed, or kept for years. Buy Tier B if you want a stand-in for a single event or a gift that will not be inspected up close. In both cases ask for real photos of the exact watch, not catalog renders, and confirm case diameter, thickness, crystal material, and movement name in writing before payment.

Limits of any replica

A fake Portofino 39 is not a genuine IWC. It cannot be serviced by the manufacturer, it has no warranty or collector value, and it will not match genuine case metal composition, finishing, or movement architecture. Counterfeit branded goods are also subject to seizure at the border in the United States, so imported replicas can be held or destroyed by customs, and trademark counterfeiting carries civil and criminal liability for sellers. Treat the purchase as a disposable fashion item rather than an investment, and set expectations about accuracy accordingly.