How Do You Tell If an IWC Portugieser IW371410 Is Fake?
The most reliable test is the case thickness combined with the movement. A genuine IW371410 in the Portugieser Chronograph family measures 40.9 mm across and 12.3 mm thick, and it runs IWC calibre 79350. Copies almost always add 1 to 2 mm of thickness and hide a cloned Valjoux 7750 inside, which the display back makes obvious.
No single detail proves authenticity on its own. Confirm the case size, the dial print, the movement finish, and the caseback engraving together before you trust a watch.
What Are the Genuine IW371410 Specs?
- Case: stainless steel, 40.9 mm diameter, about 12.3 mm thick
- Movement: IWC calibre 79350, automatic chronograph, 28,800 vph (8 beats per second), 31 jewels
- Power reserve: roughly 44 hours
- Dial: two counters, chronograph minutes at 12 o'clock and running seconds at 6 o'clock
- Crystal: domed sapphire with anti-reflective coating on both sides
- Water resistance: 30 m (3 bar)
- Strap: alligator leather on an IWC pin buckle, or a steel bracelet on some variants
Layout details such as a date aperture vary across the reference family, so match the dial to the exact variant before judging it. The final digits of an IWC reference usually encode the dial and strap combination, not a different watch.
Which Dial Details Separate Genuine From Copy?
Genuine Arabic numerals are applied, not printed, and their polished facets catch light along one edge. Copy dials use flat printed numerals or plated ones that look dull and sit a fraction too thick on the surface.
Print quality is the second clue. Under magnification, genuine lettering has sharp edges and even spacing between the logo and the Schaffhausen line. Copies show fuzzy borders, uneven gaps, and subdial rings that are printed rather than recessed with a fine concentric texture.
Does the Display Back Give It Away?
The IW371410 has a sapphire display back, so the movement is fully visible to any buyer. Genuine calibre 79350 shows Geneva stripes on the rotor, blued screws, and clean perlage on the plates. Copies show rough machining marks, a rotor engraving with the wrong font or scale, and screws that are painted blue rather than heat treated.
Watch the sweep. A 28,800 vph chronograph advances in eight small steps per second, which reads as a smooth glide. Low-grade copies run 21,600 vph movements that stutter, and some use a hand-wound chronograph that cannot match the reference at all.
What Do the Caseback Engravings Reveal?
Genuine engraving is deep, crisp, and consistent in depth across every letter and numeral. Copies are often laser etched, which leaves shallow, rounded characters that fade under angled light.
The case number on the back should match the reference and correspond to a record IWC can confirm. A mismatched number, a missing reference, or a serial that returns nothing from the manufacturer is a strong signal of a fake.
What Price Should Make You Suspicious?
A steel IW371410 sells in the high four figures to low five figures in US dollars on the secondary market, depending on condition and papers. Anything offered at a few hundred dollars is a counterfeit, no exceptions. Treat unusually low pricing as the single strongest red flag in this reference.
FAQ
Can I verify an IW371410 serial number?
Yes. An authorized IWC dealer or the brand's customer service can confirm a case number against its records. The number on the caseback should match the reference you were quoted.
Why is this reference copied so often?
Its clean two-counter dial is simple to reproduce, and the 7750 architecture has been cloned for decades. That combination lets factories build a convincing exterior at low cost, which is why the IW371410 is a frequent target.
Is a quartz movement ever correct in this watch?
No. The Portugieser Chronograph is mechanical, so a ticking seconds hand or a battery hatch confirms a fake immediately.