A fake IW371460 is a counterfeit copy of the IWC Portugieser Chronograph, and it normally gives itself away in four places: the chronograph movement, the dial printing, the case proportions and the engraving on the caseback. The fastest single test is the movement layout, because a genuine watch in this reference family runs an IWC-modified Valjoux 7750 with the running seconds at 6 o'clock, while most copies run a stock Asian 7750, a bolt-on module, or a quartz movement behind decorative subdials.
What the IW371460 is supposed to be
The IW371460 belongs to the IWC Portugieser Chronograph range, the 3714 family that has been in production in various dial colors for decades. The formula is consistent: a slim steel case in the 41 mm class, a narrow bezel, a two-register dial with the small seconds at 6 and the chronograph counter at 12, feuille leaf hands, elongated Arabic numerals, and a signed crown. Knowing that baseline is what makes a fake iw371460 stand out, because a copy has to fake all of it at once and usually fails on two or three details.
Movement check: the hardest part to copy
The genuine watch uses an IWC chronograph calibre built on the Valjoux 7750 architecture, running at 28,800 vibrations per hour with a power reserve in the mid 40 hour range. It beats in small, smooth increments and the chronograph minute counter advances one step at a time.
- Wrong subdial: if the running seconds sit at 9 o'clock, the watch cannot match a 3714 style dial layout.
- Stuttering seconds: some copies add a transfer gear to move the seconds to 6, which makes that hand jerk and drift.
- Quartz ticking: a seconds hand that jumps once per second is a quartz movement with printed subdials, not a mechanical chronograph.
- Rotor finish: genuine rotors carry clean engraving and consistent finishing. Copies show shallow laser etching, uneven brushing and missing jewel markings.
- Case thickness: adding a module on top of a stock movement pushes the case deeper than the original, which is easy to measure with calipers.
Dial and hand details
Dial work is where counterfeiters cut the most cost, and it is where a loupe pays for itself. On the real dial the IWC logo, the Schaffhausen text and the automatic line are printed with sharp edges. On copies the same text looks blobby, uneven in weight, or slightly different in letter spacing. Numerals should be thin and elongated to match the hands. Copies often show fatter numerals or a font that is close but not identical. Subdials on the original have concentric snailing that catches light; on fakes they are usually flat and printed. The feuille hands should be polished with a visible bevel and should reach the minute track, not stop short of it.
Case, crown and caseback
Look at the contrast between brushed and polished surfaces on the lugs and case flanks, then check the crown engraving, which should be crisp rather than softly lasered. The crystal on the original is sapphire with anti-reflective treatment, while many fakes use mineral glass with a blue or purple tint at an angle. Turn the watch over and read the caseback. A genuine IW371460 carries a cleanly cut reference number, a serial number, the Probus Scafusia wording and Swiss Made marking. Engraving depth, font and spacing should all be uniform, and the serial should not appear on a dozen other listings online.
Strap, buckle, box and papers
Genuine watches ship on signed leather straps with a correctly marked pin buckle or deployant clasp, plus proper packaging and documentation. Counterfeits often arrive with generic straps, a buckle with no branding or the wrong branding, mismatched serial numbers between the case and the card, and packaging that looks close in a photo but feels flimsy in hand. A serial that does not match the paperwork is one of the most common signs of a fake iw371460 being sold as genuine.
Quick verification checklist
- Ask for clear photos of the movement, the caseback and the lugs between the strap.
- Compare the dial layout against official reference images of the model.
- Confirm the running seconds sit at 6 o'clock and sweep smoothly.
- Measure case thickness and compare it with the published specification.
- Ask an authorized service center or a qualified watchmaker to open and inspect the watch before money changes hands.
Why a fake costs more than it saves
Counterfeit watches carry no manufacturer warranty and cannot be serviced by the brand, so a repair can cost more than the watch is worth. Resale value is close to zero, and in the United States importing counterfeit trademarked goods is illegal, which means customs can seize the parcel. Copies also circulate as genuine watches in private sales, where the buyer loses the full purchase price. If the goal is a genuine Portugieser Chronograph, buy from an authorized dealer or from a seller with a documented service history, and treat any offer far below market as a warning rather than a bargain.