A fake IW376025 copies the IWC Da Vinci Chronograph: a steel watch with a barrel-shaped case, two pushers, and a display back. Copies come in two grades. The low grade runs a quartz module. The higher grade uses a modified Valjoux 7750 with an added chronograph plate. Both fail on the same four points: caseback etch, movement finish, dial print, and pusher feel.
What the real reference is
IWC reference numbers carry six digits after the IW prefix. IW376025 sits in the Da Vinci Chronograph family, ref. 3760, introduced in 2007. IWC lists that family with a tonneau case, a self-winding chronograph calibre, and a sapphire back. Confirm the dial color, strap, and case metal for IW376025 against IWC records before you pay. Catalogs and owner forums do not agree on every variant, so treat any single spec sheet as a starting point.
Four checks that settle it
1. Caseback etch
The real back carries the reference, the serial, and a case number, etched at one depth. Copies use a shallow etch and repeat the same serial across batches. Ask for a photo taken at a low angle. Light rakes across a real etch. A copy looks flat and the digits blur at the edges.
2. Movement
The calibre 89360 family fills the case. Real movements show striping on the bridges, blued screws, and a signed rotor. Copies show a stock rotor, no screw collets, and plates that stop short of the case ring. A photo through the back at 10x loupe settles the question.
3. Dial print and counters
Compare the dial to IWC catalog photos of the same reference. Copy dials shift the counter centers by fractions of a millimeter and set the print heavier. Under a 3x loupe the real numerals hold an even stroke. Copy numerals thicken at the curves. Check the date window: on copies the cut sits off square with the frame.
4. Pushers and crown
Real pushers start against a firm stop and return with a click. Copy pushers feel soft and travel further. The crown on the real watch winds with light drag. A fake winds free or grinds. Start the chronograph, then reset it. Copies often stop the hand one tick past zero.
Price is a filter
A second-hand steel Da Vinci Chronograph trades under its original retail. A listing far below that band, from a seller with no service record, points to a copy. Ask for the service papers, the box, and a video call. A seller who refuses the call is a seller to skip.
What photos hide
Photos hide case polish, spring-bar fit, and rotor noise. Ask for a 30-second video: watch running, crown pulled to the time-setting position, chronograph started and reset. Listen for the rotor. A loose, rattling rotor on a watch sold as genuine is a stop sign.
Short answer
If you cannot inspect the movement through the back, do not buy. The caseback etch and the calibre finish are the two checks a copy cannot pass. Everything else, from dial print to pusher feel, adds support but does not replace them.