Short Answer

To tell a watch sold as an IW376059 from the genuine article, compare it against IWC's published data for that reference in four places: case dimensions, dial and subdial layout, movement and caseback markings, and the engraving between the lugs. A mismatch in any one of them means the watch is not a genuine IW376059, no matter how good the finish looks.

What the IW376059 Reference Is

IW376059 is a full IWC reference number, not a model name. The digits before the variant code identify the case family, and the trailing digits identify the metal, dial color, and strap combination. Two watches from the same family but with different variant codes can look alike at a distance while differing in case material, dial finish, and bracelet. Search the complete number, IW376059, when you check specs. Searching only "IWC 3760" returns the whole family and will not help you judge one watch.

Before You Start

  • A printed or saved spec sheet for IW376059 from IWC.
  • Calipers or a digital gauge for case diameter, thickness, and lug width.
  • A 10x loupe.
  • A phone camera with a macro mode.
  • Photos of a documented genuine example from a reputable dealer or auction archive.

Checks, In Order

  1. Measure the case diameter, thickness, and lug width and write the numbers down. Compare them to the published specs. Copies tend to run a fraction of a millimeter off in thickness, which is the hardest dimension to fake.
  2. Count the subdials and confirm their positions. Note which register holds what, and where the date window sits relative to the dial center.
  3. Study the dial printing under the loupe. Look at the weight of the brand mark, the spacing between letters, and the finish of the applied markers. Printed text that sits thick or blurred is a common failing.
  4. Compare the hand shapes. Check the length of each hand against the markers it should reach, and check the finish of the hand edges against a photo of the genuine piece.
  5. Turn the watch over. Read the engraved reference and serial digits under the loupe. Compare the font, depth, and spacing with the genuine engraving, which is cut rather than stamped or printed.
  6. Check the crown and pushers. Confirm their shape, the thread feel, and the markings on the crown face.
  7. Ask what movement is inside and ask to see it. Verify the caliber number against what IWC lists for the reference.
  8. Inspect the strap or bracelet and the clasp. Look for the correct hardware markings and the correct clasp mechanism.
  9. Ask for service records, the warranty card, and the original box. Match the serial on the paperwork to the serial on the case.

Where Copies Fall Short

  • Case thickness and lug profile.
  • Dial print weight and marker settings.
  • Hand finish and hand length.
  • Caseback engraving depth and font.
  • Movement finish and caliber number.

If a Watch Fails a Check

Stop the transaction and do not send funds. If you already own the watch, get a written opinion from a watchmaker who handles the brand, and keep the receipt and the listing. Selling or passing on a counterfeit watch as genuine is a trademark offense in most markets, and a private sale carries the same exposure as a storefront sale.