The short answer: a fake IW371479 and the genuine IWC Portugieser differ most in dial finishing, movement decoration, and caseback detail — the silhouette is easy to copy, the small things are not. If you are shopping a replica, judge it on those three points and ignore the polished marketing photos. This guide walks through what to compare before you commit.
Key Features to Compare
- Case proportions: the replica should mirror the original's roughly 41 mm width and slim profile instead of sitting tall and slab-sided on the wrist.
- Dial layout: twin chronograph registers, applied numerals, and a railway-track minute ring with crisp, evenly spaced printing.
- Hands and markers: leaf-shaped hands with clean polished facets; indices should be applied metal, never painted on.
- Crystal: domed sapphire with an anti-reflective coating that stays legible at an angle.
- Chronograph action: pushers start, stop, and reset with a firm, consistent click, and the seconds hand snaps back to zero.
- Caseback engraving: reference formatting, serial stamping, and the finishing around a display back.
- Strap and buckle: alligator-grain leather with tight, even stitching and a properly signed buckle.
Materials and Specifications
A quality replica of the IW371479 pairs a 316L stainless steel case — occasionally with a rose-gold-tone finish — with a sapphire crystal and a decorated automatic chronograph movement. Finishing is where the money shows: brushed flanks against polished bevels, a silver-plated or sunray dial that shifts under light, and hands that are polished rather than stamped. Weight matters too; a solid caseback and a correctly sized rotor give the watch a reassuring heft instead of a hollow rattle.
Shipping and Returns
Orders ship in protective packaging with tracking, usually within a few business days, and most sellers offer a short inspection window after delivery. Confirm the return policy covers fit, strap sizing, and movement issues before you buy, and keep the packaging intact until you have looked the watch over.
What should I check first when comparing a fake IW371479?
Start with the dial — sub-dial spacing, printing sharpness, and the alignment of any date window. Those are the cheapest details to get wrong and the easiest to spot in photos.
Is the movement the biggest giveaway?
On the wrist, no; dial finishing gives more away. Through a display back, an undecorated or poorly aligned movement is the clearest sign of a lower-tier build.
Can a well-made replica pass as genuine?
At arm's length a good example can, which is why authentication should lean on paperwork, service history, and hands-on inspection rather than photos alone.