A counterfeit IW371649 copy is a fake of the IWC Portugieser Chronograph, a 41 mm steel watch with the in-house calibre 69355 inside. The fastest check is the dial. The real watch is a two-counter chronograph: running seconds at 6, a 30 minute totalizer at 12, no date. Most fakes run a Valjoux-type movement, so they show up with an extra subdial or a date window at 3 o'clock that has no business being there.
What the IW371649 actually is
The IW371649 sits inside the IW3716 family, the current Portugieser Chronograph line. Same case as its siblings: 41 mm across, about 13 mm tall, polished bezel, brushed flanks, leaf-shaped hands, applied Arabic numerals at 12 and 6 that the subdials cut into. Inside is calibre 69355, an in-house column wheel chronograph running at 28,800 vph with roughly 46 hours of reserve and a 30 minute counter. Sapphire on both sides, so you can see the movement. That display back is a gift to anyone trying to authenticate one, and a nightmare for anyone building a fake.
Top Pick: Fake IW371649 Copy - A Comprehensive Guide
Five checks that do the work
- Layout. Two counters, at 12 and 6, period. Running seconds at 6. Anything at 9 o'clock is wrong.
- No date. There is no date window on this reference. A fake with a date aperture at 3 is telling you what movement is inside before you even take it off your wrist.
- Dial print. The IWC logo is applied metal, not printed. The minute track is crisp and even under a loupe. On fakes the track gets thick and blobby around the counters, and the "SCHAFFHAUSEN" line sits slightly off centre.
- Hands. Leaf hands, faceted, with a clean polished bevel down the middle. Fakes are often flat-stamped and slightly too wide, and the tips don't line up with the minute track.
- Caseback engraving. Reference numbers, serial, and the Probus Scafusia mark are laser-cut shallow and sharp. Fakes are stamped deep and soft, and the sapphire often sits slightly proud of the ring.
The movement is where copies fall apart
You don't need a loupe to see the difference, you need light. The 69355 has Geneva stripes with real depth, blued screws, and a signed rotor. Fakes use plated bridges with a printed or lazily engraved rotor, and the perlage is coarse. Beat rate won't save you here, since plenty of fakes run at 28,800 too. Look at the finishing quality and the position of the balance, not the number on the timegrapher. Also check the pusher feel. A column wheel movement has a light, clean click at the start of travel. The 7750 family feels mushy and slightly springy by comparison, and the reset can snap harder than it should.
What "1:1" and "first copy" actually mean
Nothing official. Sellers use those words to signal a tier, not a standard. In practice you get three rough levels: cheap fakes with the wrong layout, mid-tier copies with a correct dial but a modified Asian movement and a stamped caseback, and top-tier builds that clone the case and dial closely but still carry a non-IWC movement. Even the best of them fails the movement test, and none of them will survive a service at an authorised watchmaker.
iwc iw371649 replica counterfeit
Weights and materials help but they mislead. A good fake on a leather strap feels close enough that handling it won't settle anything. Trust the dial layout and the movement, not the heft.
Price sanity check
A real Portugieser Chronograph trades well into four figures on the secondary market, and fakes sit between a few hundred and just under a thousand dollars depending on tier. If someone offers you a "steel Portugieser chrono" at a fraction of market price with no box, no papers, and a story about a gift, that's the whole answer. Buy the seller, not the watch.
Bottom line
If you want the Portugieser look without the real thing's bill, buy something that is honestly sold as a replica, not a counterfeit passed off as genuine. Passing one on as real is trademark counterfeiting in the US, and the resale risk lands on you. If you're buying the real thing, ask for the movement photo, check the two-counter layout, and walk away from any date window.