Spotting a fake IWC ref. IW371460 comes down to five measurable details: a case about 41 mm wide and 12 to 13 mm thick, a bi-compax dial with the 30-minute counter at 12 and running seconds at 6, sapphire crystal with a strong blue anti-reflective glare, a movement beating at 28,800 vph (4 Hz), and crisp laser-deep engraving on the caseback. If you want the look without the retail price, the closest stand-ins are other Portugieser references, the IWC Portofino Chronograph, and bi-compax chronographs from Longines, Frederique Constant, and Zenith. Replica versions of the same reference range from quartz junk to four-figure super clones, and the difference shows up in thickness, crystal coating, and subdial spacing.

Fake IW371460 Comparison Chart: A Buyer's Guide to Replica IWC Portuguese

What is the IWC ref. IW371460?

IW371460 sits inside the IWC Portugieser Chronograph family, the line IWC has produced since the 1990s and refreshed in 2020 with the 41 mm generation. It is a stainless steel bi-compax chronograph with leaf hands, applied Arabic numerals, a printed rail-track minute ring, and an unusually clean dial for a chronograph.

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Current references run an in-house calibre 69355, while older ones use calibre 79350, a heavily modified Valjoux 7750 base. Both beat at 4 Hz and deliver roughly 44 to 46 hours of power reserve.

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Key specs to memorize

  • Case size: about 40.9 to 41 mm wide, 12 to 13 mm thick
  • Dial layout: 30-minute totalizer at 12, small running seconds at 6
  • Crystal: domed sapphire with double anti-reflective coating
  • Water resistance: splash resistance only, not a dive rating
  • Beat rate: 28,800 vph, which reads as a smooth sweeping seconds hand

How do you tell a fake IW371460 from a genuine one?

Fakes fail on measurements first and cosmetics second. Bring a caliper and a 10x loupe, and check the numbers before you argue about the dial.

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Case, crystal, and proportions

  • Measure the diameter and thickness. Replicas commonly run 1 to 2 mm too thick because the donor movement sits taller than the in-house calibre.
  • Look at the crystal glare. Genuine double AR coating produces a violet-blue sheen; cheap fakes look flat or green.
  • Check lug shape and polishing. Genuine lugs are sharply defined with a crisp transition between brushed and polished surfaces.

Dial and hands

  • Print quality under magnification: genuine text has razor edges, fakes show fuzzy or doubled letters.
  • Subdial spacing and depth. The two subdials should sit on the same horizontal axis with recessed, sharply cut rings.
  • Hand finishing. Genuine leaf hands are polished on the bevels with clean, evenly filled luminous or painted centers.

Movement and caseback

  • Watch the seconds hand. A quartz fake ticks once per second; a low-grade mechanical fake running at 21,600 vph looks slightly stuttery next to a genuine 4 Hz sweep.
  • Read the engraving. Genuine casebacks use an IW prefix plus six digits, with sharp, uniform depth and no filler between letters.
  • Listen and feel. Genuine chronograph pushers have a firm, short throw and a clean reset to zero every time.

Which watches look most like the IW371460?

Several chronographs share the thin bezel, round case, and twin-subdial layout that define the Portugieser look.

  • IWC Portugieser Chronograph 3716 series: the direct successor with the same silhouette.
  • IWC Portofino Chronograph 39: same brand, dressier case, similar dial balance.
  • Longines Master Collection Chronograph: closest sub-$5,000 alternative in size and layout.
  • Frederique Constant Flyback Chronograph Manufacture: in-house movement, classic bi-compax dial.
  • Zenith Chronomaster Revival: higher-end option with a similar round case and twin registers.

Replica tiers for the IW371460 look

  1. Budget tier (under about $150): quartz or low-grade automatic, wrong thickness, printed dial, weak plating.
  2. Mid tier (a few hundred dollars): Asian 7750-based automatic, decent case, subdials in roughly the right place, average crystal coating.
  3. Top tier (four figures): cloned case geometry, sapphire with proper AR, engraved rotor, accurate dial print, and dimensions within a fraction of a millimeter.

What should you check before buying a similar or replica watch?

  • Ask for the exact case diameter and thickness in millimeters, not a photo.
  • Request a movement photo showing the rotor engraving and balance wheel.
  • Confirm the crystal type and whether anti-reflective coating is applied on both faces.
  • Verify subdial function: the 12 o'clock register should count 30 minutes, and the 6 o'clock register should run seconds.
  • Confirm return policy and service support, since chronograph movements need servicing.

FAQ

Is the IW371460 still in production?

The older 3714 generation was discontinued and replaced by the 41 mm 3716 references in 2020, so the original reference is a secondary-market watch today.

Do replica Portugieser chronographs use the same movement?

No. Most replicas use a Valjoux 7750 clone or a quartz module, neither of which matches the in-house 69355 in finish, serviceability, or power reserve.

Is a 30-meter rated watch safe for swimming?

No. That rating covers splashes and rain only, and replica cases often seal worse than the genuine article.