Short answer: the IW376053 is a 43mm steel IWC Da Vinci Chronograph from the 3760 generation, and a fake of it gives itself away through the movement before anything else. The real watch runs IWC's in-house calibre 89360, a flyback chronograph with the chronograph hours and minutes stacked in a single subdial at 12 o'clock. Most replicas of this reference use a modified ETA 7750 instead, and that one fact is visible from across a table.
What the reference actually is
The 3760 line arrived in the late 2000s and sits apart from the 2017 Da Vinci relaunch, so don't let a seller mix the two. The core spec is a round steel case around 43mm across, roughly 14mm thick, with curved lugs that hug the wrist, sapphire on both sides, and 30m of water resistance. Inside is the 89360, an integrated column-free flyback chronograph running at 28,800 vph with a long power reserve. The dial is the signature: running seconds at 6, and the chronograph hours and minutes sharing one counter at 12.
The movement tell
This is where I start every inspection.
- The 12 o'clock counter. On a real 89360 that subdial tracks hours, so its hand keeps creeping after the first hour of timing. On a 7750-based replica the subdial usually tracks 30 minutes and then sits still. Look at the markings: 0 to 30 means the builder never solved the layout.
- Running seconds placement. A 7750 puts seconds at 9 out of the box. Moving them to 6 needs extra gearing, which often shows up as a stuttering sweep.
- Flyback function. Genuine flyback resets and restarts with one push, without stopping first. Most fakes just stop, reset, start, which is a different sequence.
- Thickness. Swapping in a 7750 layers on a plate and rotor, so a replica case often runs 1 to 2mm thicker than the original. Measure it with a caliper rather than trusting the listing.
Case, crystal and finish
Run a finger along the case flanks. Good work keeps the polished and brushed zones separated by a crisp line; cheap work blurs them. Check the lug profile, the crown size and the shape of the pushers, since those are often lifted from a generic chrono blank. The crystal should have a faint blue or purple AR tint under a lamp. Flat white reflections usually mean a plain mineral or uncoated sapphire.
Dial and hands
Print quality is the next filter. Appied indices should sit level with sharp edges and no glue haze around the feet. The date window should be cleanly cut and the date wheel should sit flush. Look at hand length: replicas are frequently fitted with hands that stop short of the minute track or overshoot it. Under a loupe, the subdial rings should be concentric and evenly spaced.
Caseback and strap
Engraving depth matters more than the wording. Genuine engraving cuts into the metal with sharp walls; laser etching on a fake looks shallow and slightly grey. Model and reference numbers should match the watch in front of you. On the strap side, check the deployant or pin buckle for a clean fold and even polish, and look at the stitching line, which tends to wander on budget builds.
Questions worth asking
- Which movement is inside, and does the 12 o'clock counter track hours or minutes?
- What is the measured case thickness, in millimetres, at the crown?
- Does the chronograph reset with a single pusher press while running?
- Are the dial photos taken in daylight, without colour grading?
- Can the seller show the caseback engraving in focus?
Answer those five and you know what tier you are looking at. The IW376053 is a hard reference to clone well because of the 89360, so the honest ones tend to be the mid-tier builds with a plainly labelled 7750 inside. There is nothing wrong with that, as long as nobody sells it to you as something it isn't.