A replica IW371645 is an unlicensed copy of the IWC Portugieser Chronograph reference IW371645. IWC Schaffhausen does not make or authorize it, and because it carries protected trademarks, importing one into the United States is illegal and the shipment can be seized.
That single fact shapes everything below. If you searched for a replica IW371645 because you like the look of the Portugieser, it helps to know what the real reference is, how the copies are marketed, where they fall short, and what the legal exposure looks like for a buyer in the US.
What the IW371645 reference actually is
The IW371645 sits inside the IWC Portugieser Chronograph family, the 3716 series that has anchored the Portugieser line for years. The classic recipe is a round stainless steel case of roughly 41 mm, a two-register chronograph layout with subdials at 12 and 6 o'clock, applied Arabic numerals, slim feuille hands, and a clean outer minute track.
Earlier 3716-generation chronographs are widely documented as using the 79350 caliber, a chronograph movement built on the Valjoux 7750 architecture with a modular chrono section and a rotor that winds in one direction. Dial colors, strap options, and small detail changes vary across the reference range, so the exact configuration tied to IW371645 should be confirmed against IWC's own reference records rather than a seller's listing.
What sellers mean by a replica IW371645
Listings use loose marketing labels such as AAA, 1:1, Swiss movement, or super clone. None of these terms has a published standard, an inspection body, or a warranty behind it. They are sales language, not quality grades, and the same label gets applied to watches that vary wildly in finish and reliability.
What the labels hide is the practical reality of the counterfeit supply chain:
- No factory service network, so a failed movement usually means the watch is scrap.
- No spare parts supply, because the parts were never made for a legitimate product.
- No serial number integrity, so resale value is effectively zero.
- No recourse if payment is taken and nothing ships.
Where the copies fall short
Side by side with a genuine Portugieser, the differences show up in predictable places:
- Movement: finishing, rotor decoration, winding feel, and chronograph reset are the hardest things to copy at low cost.
- Case and lugs: polished and brushed transitions, lug curvature, and crown guards rarely match the original geometry.
- Dial: printed text weight, applied numeral edges, and subdial spacing are usually slightly off.
- Crystal: anti-reflective coating on a genuine IWC is applied on both surfaces and looks almost invisible at an angle.
- Water resistance: claims are not backed by testing, so swimming with one is a gamble.
Legal risk for US buyers
Counterfeit branded goods are treated as contraband at the border. US Customs and Border Protection can detain, seize, and destroy a shipment, and repeat importers can face civil penalties. Trafficking in counterfeit goods is also a federal offense, and the trademark owner can pursue civil claims separately.
Beyond the legal angle, there is a data angle. Many counterfeit sellers run unregulated checkout pages, and card details shared with them are a documented fraud risk.
How to spot a counterfeit IW371645
- Check the caseback engraving. Genuine engraving is crisp and consistent, with reference and serial numbers that can be verified.
- Compare dial typography. Look at letter spacing in the brand name and the weight of the printed scales.
- Look at subdial placement. Misalignment or a slightly different gap between the two registers is a common tell.
- Weigh it. Case dimensions and heft that feel off usually point to a different alloy or a hollow case.
- Question the price. A current-model Portugieser selling far below the pre-owned market is the oldest signal there is.
- Ask for paperwork. Original box, warranty card, and service history separate a real watch from a copy.
Better ways to get the look
If the Portugieser design is what draws you in, a pre-owned genuine IWC bought from a reputable dealer with full papers is the only version that holds value and can be serviced. Legitimate independent brands also make clean, two-register chronographs in their own designs at lower price points. Either route gives you a watch with a real service path instead of a counterfeit IW371645 that no watchmaker will touch.
FAQ
Is a replica IW371645 the same as the genuine watch?
No. It copies the appearance only. The movement, materials, finishing, and quality control are all different, and it carries no IWC warranty.
Can a watchmaker service a replica IW371645?
Most will not. Parts are not available through any authorized channel, and a repair often costs more than the watch.
Can customs seize a replica watch?
Yes. Counterfeit trademarked goods are subject to seizure and destruction at the US border, and the buyer can lose both the watch and the money paid for it.