Fake IW371447: the short answer
A fake IW371447 is any watch presented as an IWC Portugieser Chronograph that IWC never made. The genuine reference is a 40.9 mm stainless steel chronograph with a blue dial, subdials at 12 and 6, applied numerals, a railroad minute track, and IWC calibre 79350, a modified Valjoux 7750 running at 28,800 vph. Fakes start at quartz junk under $50 and climb to $400 super clones that copy the case and dial well. The gap between a good replica and the real thing shows up in three places: movement finish and function, dial printing, and caseback engraving.
What the genuine reference looks like
Blue sunburst dial, thin leaf hands, a printed railway minute track around the outer edge, applied rhodium numerals, two recessed subdials (chronograph minutes at 12, running seconds at 6), no date aperture, and a steel case mixing polished and brushed surfaces. The pushers sit at 2 and 4, and the crystal is domed sapphire with anti-reflective coating on both faces.
That crystal detail matters on a fake. Cheap glass reflects hard under a phone light and throws a strong purple or blue cast. A genuine IWC crystal nearly disappears at most angles.
The tells that catch most fakes
- Subdial spacing. The 79350 layout fixes where the subdial centers sit. Fakes built on another base movement, or on a quartz module, often squeeze them too close together or spread them too far, and the dial looks crowded or empty.
- Dial printing. Study the IWC mark and the SCHAFFHAUSEN line beneath it. On a fake the letters run thick, uneven, or spaced wrong, and the minute track lines blur together at this size.
- Hands. Genuine leaf hands have crisp polished facets and reach the minute track. Fakes are short, flat, or painted instead of polished.
- Case thickness and profile. Replicas tend to run thicker, and the lug curve sits wrong on the wrist. Compare the side profile to reference photos.
- Caseback engraving. Reference number, serial, and brand text should be cut clean and deep. Laser-etched fake text looks shallow and slightly fuzzy under a loupe.
- Date window. This reference has none. A date at 3 o'clock means a different watch or a fake.
Movement: where replicas lose
Most decent fakes use an Asian 7750 clone. It runs, the chrono works, and at arm's length it passes. Up close, the rotor engraving is shallow, the bridge finishing is coarse, and the screws are plain steel rather than blued. Quartz fakes are easier to catch: the chronograph seconds hand ticks once per second instead of sweeping, and the reset snaps in a visible jump.
Testing takes a minute. Start the chrono, let it run, stop it, then reset. The hand should fly back to zero and land there. On a bad fake it lands slightly off, or the minute counter lags behind.
What replica tiers actually buy you
Under $100 gets a quartz or low-grade automatic with the wrong subdial layout, a plated brass case, and a dial that photographs better than it looks in hand. Around $200 to $400 gets a steel case, an Asian 7750, and a dial that copies the blue sunburst and the printed track. Above that you pay for better hand finishing and a closer caseback, not for anything a watchmaker would call correct. No replica carries the 79350, so the movement is always the honest answer.
A quick check before you spend
- Ask for a video with the chrono running, not just stills. Stills hide misaligned subdials.
- Ask what movement sits inside. A seller who cannot answer is a seller to skip.
- Compare the caseback text to reference photos of the same production year.
- Hold the watch if you can. Plated brass feels light and hollow for its size.
- Press the pushers. Firm click in, clean snap back.
Bottom line
The IW371447 is hard to fake well because the dial is mostly open space, and open space exposes every mistake. Subdial spacing, printing, and hands carry the whole look. Buyers who know those three things spot most fakes from a photo. Buyers who don't end up learning from a watchmaker, and that lesson costs more.