A fake IW371788 is a counterfeit copy of an IWC Portugieser Chronograph reference. It imitates the 41 mm steel case, the two-register dial layout and the overall proportions of the original, but it is assembled from different parts, runs a different movement and goes through none of the brand's quality control.

That is the short answer. The sections below cover what the reference actually is, which details replicas get wrong, and how to judge a copy if you run into one.

What the IW371788 reference is

The IW371788 belongs to IWC's Portugieser Chronograph range, the brand's long-running line of round steel chronographs. The family formula has stayed consistent: a case around 41 mm, slim lugs, a domed sapphire crystal, applied markers on a clean dial, and two subdials stacked at 12 and 6. Pushers sit at 2 and 4 with the crown between them. Across generations the line has used both modified third-party chronograph calibers and in-house movements.

Because reference numbers inside a family change with dial color, case metal and market, the exact specification of IW371788 should be checked against the brand's own documentation rather than a marketplace listing.

How to tell a fake IW371788 from the real watch

• Dial printing. Genuine text is thin, crisp and evenly spaced. Copies show thicker strokes, uneven gaps between letters, or print that sits slightly off the dial's center line.
• Subdial placement. On the original, the two registers sit on the vertical axis at 12 and 6 with even spacing and a defined step from the dial surface. Copies often shift them off center or leave the registers flat against the dial.
• Hands. Original hands are faceted and polished, with edges that catch light. Replica hands tend to be thicker or softer at the edges, with a flat satin finish.
• Case and lugs. Watch the transition from the case flank to the lug. On a real watch, polished and brushed surfaces meet at a sharp line. On a fake that line often blurs.
• Crystal. Replicas frequently apply a coating on one side only, which shows as a bluish or milky cast under angled light.
• Case back engraving. Reference, serial and material stamps on real watches are deep and finely cut. Fake lettering is usually shallow, wider, or inconsistent between font strokes.
• Weight and feel. Not conclusive alone, but a case that feels light or a bracelet with play at the end links is a warning sign.

Replica grades and what the price brackets buy

Not every fake IW371788 is the same product. The market splits into rough tiers, and the differences show up on the wrist more than in photos.

• Entry tier. Stamped or cast case, generic quartz or low-grade automatic movement, printed dial, mineral crystal. Usually obvious in hand.
• Mid tier. Machined case with better brushing, a decorated automatic movement, sapphire crystal. Convincing at a glance, wrong up close.
• High tier. Closer case geometry, better dial printing, a cloned or heavily modified chronograph movement with engraved bridges. Even the best of these differ in hand finishing, pusher feel and long-term reliability.

No replica carries the original's movement architecture, service network or spare parts supply.

Movement: what usually sits inside

Replica chronographs almost never match the genuine caliber. Most run a Chinese-made automatic chronograph movement, sometimes with a decorative plate and engraved rotor shaped to resemble the real movement from the back. The tell is behavior rather than decoration: a chronograph that starts with a soft or grinding pusher, a seconds hand that stutters, or a power reserve that falls short of what the seller claims.

Why photo comparisons let buyers down

Most spot-the-fake guides rely on side-by-side photos under studio light. That setting hides the details that matter. A camera flattens polishing, hides crystal coating tint, and cannot show how a pusher feels or how a rotor sounds. If you are judging a watch, ask for angled natural-light photos of the case flank and the dial at 12, plus a clear shot of the movement.

Legal and practical risks

In the United States, importing or selling counterfeit goods is illegal, and customs officers can seize shipments. The practical risks matter too:

• No manufacturer service, no genuine parts and no warranty.
• Resale value is close to zero, and honest resale is not possible because the watch is not what it claims to be.
• Water resistance is rarely tested, so wearing a replica near water is a gamble.

This guide is written for identification and awareness. Passing a replica off as genuine to a buyer is fraud.

FAQ

Is a fake IW371788 the same as a super clone?

No. Super clone is a seller's term, not a standard. It signals a higher tier of replica but says nothing verifiable about the movement, materials or finishing.

Can a watchmaker tell a fake IW371788 from the real one?

Usually yes. A trained watchmaker inspects the movement, the case construction and the dial under magnification, and those are the areas replicas cannot fully match.

How much should a fake IW371788 cost?

Prices vary by tier and seller, and no price makes a counterfeit genuine. Treat any figure far below the market value of the real reference as a signal rather than a bargain.