There is no good replica of the IWC Da Vinci Chronograph IW376003, and that is the short answer. The watch comes from the late 2000s and runs IWC's in-house calibre 89360, a flyback chronograph that shows elapsed hours and minutes together in a single subdial. Nobody copying this reference has reproduced that movement. Every "first copy" I have handled runs a stock Valjoux-type 7750, which means the dial layout is wrong before you even look at the finishing. Buy it as a costume piece if you want the shape on your wrist. Do not buy it expecting the real watch.
What the genuine IW376003 actually is
The Da Vinci Chronograph of that era is a round steel chronograph with articulated lugs. Those lugs pivot slightly so the strap follows the wrist, and they are one of the reasons the watch wears better than its dimensions suggest. Inside sits the calibre 89360, IWC's own chronograph movement with a 68-hour power reserve and Pellaton winding. The party trick is the chronograph readout: hours and minutes share one counter, so elapsed time reads like a normal watch dial instead of two separate hands on two separate subdials. That design choice is the whole point of the watch.
Why this reference gets copied badly
Replica factories copy what sells in volume. Current Aquatimers and Portugieser chronographs get the attention because the movements are simpler and the demand is huge. An older Da Vinci with a movement nobody can source is a hard build, so the copies that exist are mostly 7750-based watches dressed up to look close from three feet away.
- The chronograph layout is wrong. A 7750 gives you a 30-minute counter and a 12-hour counter in separate places. The genuine watch combines them.
- The lugs are usually fixed. Real ones articulate.
- Case proportions drift. Copies tend to sit taller and heavier through the mid-case.
- Dial printing is soft, and the applied markers catch light differently than the real ones.
- Caseback engraving is shallow, and the reference number font is often wrong.
How I check one in hand
- Start the chronograph and let it run past 30 minutes. On a genuine 89360 the combined counter keeps climbing. On a fake the minute hand snaps back to zero and the second counter starts.
- Press reset while the chronograph is running. A true flyback resets and restarts in one push. A 7750 forces you to stop first.
- Rock the lugs with your thumb. They should move a little against spring pressure, not sit solid.
- Look at the date aperture under a loupe. Edges on copies are rough, and the printing sits too high on the disk.
- Turn the crown. Genuine winding is smooth and slightly heavy. Loose or gritty means a cheap stem and tube.
- If there is a display back, look at the rotor engraving and the bridge finishing. Decorated 7750 rotors rarely match IWC's stripes or the Probus Scafusia text.
Should you buy a first copy version?
Only if you accept the trade. You get the general silhouette of a discontinued chronograph for a fraction of the price, and you get a watch that no collector will ever mistake for the real thing once the chronograph is running. Parts support is another issue. A 7750 can be serviced almost anywhere, which is the one practical advantage. Resale value is close to zero.
One legal note matters here. Selling a counterfeit as genuine is illegal in the US, and customs can seize shipments of infringing goods. Buy from a seller who describes the watch as a replica in writing, keep the listing, and never pay by methods you cannot reverse.
The bottom line
If you want an IW376003, save for the real one. It is a genuinely interesting chronograph with a movement that deserves the case. If you want the look and nothing more, a replica is a known compromise, and the subdial layout is the first thing to check and the fastest way to spot a lazy build.