Short answer
A replica Da Vinci IW376045 is a third party copy of an IWC Da Vinci watch. IWC assigns six digit references to the Da Vinci line. Numbers in the IW3760 block sit inside that line, and public catalogues list Da Vinci Automatic and Da Vinci Chronograph models under it. Confirm the exact variant against an IWC source before you pay. A listing with this number is selling a watch built to the case shape and dial layout of a Da Vinci. The movement, the case finishing and the case back are not IWC parts.
What the number covers
The Da Vinci family has a round case, arched lugs and a dial with applied markers. Chronograph versions add two sub counters and a pusher pair at 2 and 4 o'clock. Sellers who quote IW376045 describe a steel case, a leather strap and a folding clasp. Ask for the measured case diameter in millimetres and the lug width. Ask for a photo of the case back on the actual unit, not a stock image. If the seller cannot supply those, the number is a label and nothing more.
What changes on a copy
- Movement: a copy runs a third party automatic or quartz calibre. Beat rate, power reserve and chronograph actuation differ from the original.
- Case back: engraving depth and font weight are the parts buyers spot first.
- Crystal: mineral glass or coated sapphire. Coating scratches; uncoated sapphire does not.
- Dial print: index thickness, date window cut and sub dial spacing vary between batches.
- Weight: a copy in steel with a thin case reads light in the hand. Ask for grams.
Checks before paying
- Get the case diameter, thickness and lug width in numbers.
- Get photos of the front, the case back and the clasp from the unit in stock.
- Ask which movement is inside and the stated power reserve.
- Ask what water resistance the case is tested to. Treat 30 m as splash resistance, not swimming.
- Confirm the return window in writing.
- Confirm the strap size so a replacement fits.
Price and care
First copy prices for a Da Vinci style watch sit well under the price of an IWC original. Price tracks the movement, the crystal and the dial finishing. A low price with a sapphire claim and a Swiss movement claim is a warning, not a bargain. For care, wind a manual movement at the same hour each day, keep an automatic on a winder or wear it, and keep leather straps away from water. Service intervals for third party calibres run about three to five years. No public IWC datasheet matches IW376045 in full, so verify the reference with IWC before you rely on it.