A search for fake iw371632 usually comes from one of two situations: someone has been offered an IWC Portuguese Chronograph at a price that does not add up, or someone wants to know how closely a replica copies that particular reference. The short answer is that IW371632 is a genuine IWC reference, and any example sold outside an authorized dealer network has to be judged on its own merits, because a reference number printed on a caseback proves nothing by itself.
What the IW371632 reference actually is
IW371632 belongs to the IWC Portuguese Chronograph family, the line defined by a wide, uncluttered bicompax dial and a slim bezel that leaves a lot of dial visible. The look is deliberately restrained: applied numerals, leaf shaped hands, and two subdials rather than three.
- Stainless steel case of roughly 41 mm, with a polished caseband and a thin bezel
- Bicompax layout: small running seconds at 6 o'clock and a 30 minute chronograph counter at 12 o'clock, with the chronograph seconds carried on the central hand
- Sapphire crystal with antireflective coating on both sides
- Alligator leather strap with an IWC signed pin buckle or folding clasp, depending on the version
Because the 3716 family spans several dial colors, strap options and production years, always confirm the exact case diameter, dial layout and calibre for the specific version you are looking at against IWC's own product information before you compare anything else.
Why the layout is the first thing to check
Many inexpensive chronograph replicas are built on a generic modular movement that puts the running seconds at 9 o'clock and a 12 hour counter at 6 o'clock. That layout does not match the Portuguese Chronograph. If the subdials sit anywhere other than 6 and 12, the watch is not copying this reference correctly, whatever the caseback says. This single check rules out a large share of poor replicas before you look at anything else.
Dial and case details that give a replica away
- Printing quality: genuine dial text is crisp and evenly spaced, while replicas often show thicker strokes, uneven tracking or slightly crooked numerals
- Applied markers: the metal indices should sit flat, be evenly polished and throw clean reflections, not look milky or soft at the edges
- Hands: the leaf hands should be finely finished with a visible bevel, and the subdial hands should reach the correct track
- Crystal: a strong blue or purple tint at an angle often points to a cheap aftermarket crystal rather than the double sided coating IWC uses
- Case finishing: look for a sharp transition between brushed and polished surfaces, and for uniform brushing direction
Movement and caseback checks
Modern Portuguese Chronograph models use an IWC in-house chronograph calibre with a column wheel, visible through a sapphire caseback on the references that have one. Under a loupe, a genuine movement shows Geneva stripes, blued or polished screws, and engraved bridges. A replica typically shows a matte or roughly striped finish, screws with damaged slots, and a rotor engraving that is stamped rather than engraved.
On the outside of the caseback, check the reference and serial number engraving. Genuine engraving is cut into the metal with clean edges. Lasered or printed numbers on a replica often look shallow, sit on top of the surface, and use a font that is slightly too wide or too narrow.
Strap, clasp and paperwork
The alligator strap on a genuine watch has tight, regular scale patterns and even hand stitching. Replica straps usually use embossed calf leather, thinner thread, and a buckle with a soft or blurred logo. Boxes and papers are easy to copy, so treat them as supporting evidence rather than proof. Invoices, dealer stamps and service records carry more weight because they can be traced.
How to authenticate an IW371632
- Photograph the dial, caseback and movement clearly in daylight.
- Compare the subdial layout, case size and dial text against official reference data.
- Ask an authorized IWC service center or a qualified watchmaker to open the case and inspect the movement.
- Request the service history and check that the serial number has not been reported as stolen.
- Have an independent appraiser confirm the result in writing before money changes hands.
FAQ
Does the reference number on the caseback prove it is real?
No. Reference numbers are copied constantly. They are a starting point for comparison, not a guarantee.
Can a replica use a genuine IWC movement?
It happens occasionally when a movement is transplanted from a damaged watch, but most replicas use a generic modular chronograph or a low grade clone.
Is a low price always a red flag?
Not always, but a Portuguese Chronograph offered far below the typical secondary market range from a private seller with no history deserves full authentication before purchase.