Short answer
A fake IWC ref. IW323736 gives itself away in four places: the caseback engraving, the movement behind that caseback, the date wheel font, and the fit of the bracelet. Genuine IWC casebacks are cut with crisp, shallow lettering and even spacing. Most copies use laser etching that looks fuzzy or grey under a 10x loupe. Their movements are generic or cloned, not the IWC-finished caliber the reference calls for. Confirm the reference itself first, then work through the checks below in order and stop as soon as one fails.
What you need
- A 10x jeweler's loupe or a phone with a macro lens
- Digital calipers that read to 0.1 mm
- A kitchen scale that reads to 1 g
- A watchmaker who will open a caseback for a small fee
- The official spec sheet for the reference and variant you are buying
Step-by-step authentication
- Look up IW323736 in IWC's own reference data and write down the case size, movement caliber, water resistance, and the dial variants that belong to that reference.
- Measure the case with calipers and weigh the watch, then compare both numbers with the official specification for that exact variant.
- Inspect the dial with the loupe and check that every letter of the brand name and the model text is sharp, evenly spaced, and printed flat to the dial surface.
- Pull the crown to the date position and compare the date font with photos of a genuine example, watching the shape of the 1 and 4 and the gap between digits.
- Study the caseback under the loupe and confirm the reference and serial numbers are engraved metal, not a printed or lasered surface.
- Ask a watchmaker to open the caseback, photograph the movement, and compare the rotor engraving, jewel count, and finishing with the caliber listed for the reference.
- Wind and set the watch and confirm the crown has firm detents, seats into the tube without wobble, and screws down with a clear stop if it is a screw-down crown.
- Flex the bracelet and listen for rattle, then check the end links meet the case with an equal gap on both sides and that the clasp logo is stamped, not etched.
- Tilt the crystal under a lamp and look for a faint blue or purple tint on the inside surface, since cheap crystals are uncoated or coated on the outside only.
- Compare the serial number on the caseback, the movement, and the paperwork, and walk away if all three do not agree.
- Ask for the service history or a recent service invoice and call the service center to confirm the work was done on that serial number.
Movement and caseback
The movement is the hardest part to fake at a low price. A genuine IWC caliber carries a signed rotor, a defined jewel count, and finishing that matches the reference. Copies often use a stock movement with a glued-on or poorly engraved rotor plate. Look at the balance bridge and the engraving depth, not just the logo.
Bracelet, crown, and crystal
Bracelet fit is where budget replicas fail most often. Genuine links move smoothly, the clasp closes with a solid click, and the crown turns with resistance instead of spinning loose. Crystal coating matters too: genuine sapphire has anti-reflective treatment on the inner surface, which is what produces that faint tint when you tilt the watch.
Papers, box, and serial numbers
Papers are easy to print, so treat them as supporting evidence, not proof. Match the serial number on the warranty card to the caseback and the movement. Ask the seller for the original purchase receipt and the name of the dealer, then verify that the dealer is an authorized IWC retailer.
Seller and price red flags
- A price far below the current market range for that reference
- Photos shot only from the front, with the caseback left out
- A refusal to meet at a watchmaker or boutique for inspection
- Payment requests by wire, gift card, or crypto only
- A story that explains away mismatched numbers or missing paperwork
If you already bought a fake
- Stop wearing the watch and photograph every angle, including the caseback and the paperwork.
- Save the listing, the messages, and the payment record.
- Ask a watchmaker for a written opinion on the movement and case.
- Request a refund from the seller in writing and set a deadline.
- Dispute the payment through your card issuer or platform if the seller refuses.