A fake IW371788 is a replica of an IWC Portugieser chronograph, a two register steel watch with a slim bezel and an in-house automatic chronograph movement. The copy imitates the silhouette and dial layout, so it can look convincing in photos, but case finishing, dial print, crown action, and caseback engraving are where it separates from the genuine article.

What the IW371788 reference points to

IWC reference numbers that start with 3717 belong to the Portugieser chronograph family. That family shares a set of recognizable traits: a round steel case in the low 40 mm range, a narrow bezel that leaves most of the dial visible, feuille shaped hands, applied Arabic numerals, and two subdials instead of three. The running seconds sit at 6 o'clock and the chronograph minute counter sits at 12 o'clock, which gives the dial its balanced, almost symmetrical look.

Because that design is simple, it is also easy to copy. There are no tourbillons or openworked bridges to reproduce. That is part of why the IW371788 shows up so often in the replica market: a factory only has to get a flat dial, a pair of chronograph hands, and a case profile close enough to pass at arm's length.

What to inspect on a replica IW371788

If you are evaluating one, work through these points in order. Each check is cheap to perform and hard for a low grade replica to fake.

Case and proportions

• Measure the diameter and thickness. Replicas often run slightly thicker because the movement and spacer need more room.
• Look at the lug shape. Genuine lugs curve inward with a soft bevel, while cheap copies leave them blocky and flat.
• Run a fingernail along the case flank. It should feel smooth, with a clear break between polished and brushed surfaces.

Dial and hands

• Subdial rings should be crisp and evenly printed. Fuzzy or doubled printing is a giveaway.
• Applied numerals should sit flat and catch light at their edges.
• Feuille hands should taper into a fine leaf shape, not a blunt teardrop.
• Check the date window if the model has one. Alignment and font weight vary widely on replicas.

Movement and chronograph feel

Start and stop the chronograph a few times. A genuine column wheel or vertical clutch chronograph engages with a light, even push and the seconds hand snaps back to zero without hesitation. A cheap replica, usually running a modified third party movement, feels gritty, and the hand stutters before it moves.

Caseback and engraving

Reference numbers, case numbers, and the brand mark should be sharp with consistent depth. On replicas, engraving tends to be shallow, uneven, or off center, and the font is subtly wrong, for example a wider letterform or a squeezed serial number.

Strap, clasp, and crystal

Genuine versions ship on alligator leather with a signed pin buckle or folding clasp. Replicas often use embossed cowhide and hardware that feels light or has rough edges. The sapphire crystal should be clear with an anti reflective coating that cuts glare, not a milky tint.

Genuine versus replica: where the differences show

Side by side, the gap widens. The genuine case has sharper transitions, the dial gains depth from the applied markers, and the rotor winds with a smooth, quiet feel. Replicas often have a louder rotor, a rougher crown thread, and a caseback that does not sit flush. None of these are difficult to spot once you know what to look for.

Price signals worth knowing

Replica pricing clusters into tiers. Entry level copies sit at the bottom and usually show the faults above within minutes. Mid tier copies fix the dial and case but keep a stock movement. The top tier spends its budget on the dial, crystal, and finishing, and that is the version most shoppers are hunting for when they search "fake IW371788." If a listing claims genuine IWC status at a fraction of the secondary market price, treat it as a replica.

Practical and legal notes

Replica watches are illegal to sell as genuine goods, and importing them can lead to seizure and disposal at customs. Some countries also restrict resale. If you buy a replica knowingly, keep the receipt and any description that identifies it as a replica, and never pass it on as an original. Buyers who want the real reference should buy from an authorized dealer or a seller with service history and papers.

FAQ

Is a fake IW371788 the same as a super clone?

No. Super clone is a marketing label that sellers apply to higher grade replicas. It describes a tier of copy, not a fixed standard, so judge the watch on the checklist above rather than on the label.

Can a watchmaker tell a replica IW371788 from the genuine watch?

Usually yes, and fast. Movement finishing, caseback engraving, and dial print are the three quickest tells.

What should I check first?

Start with thickness and the feel of the chronograph pushers. Those two checks eliminate most low grade replicas before you look at anything else.