Short Answer
A fake IW327012 rarely matches three things at once: the 40 mm stainless steel case, the sunburst blue dial with crisp white printing, and the engraved Le Petit Prince case back. The genuine watch runs caliber 35111 with a 42-hour power reserve, and its serial number matches the paperwork. If any one of those checks fails, treat the watch as counterfeit and walk away.
Real IW327012 Specs to Memorize
- Case: stainless steel, 40 mm diameter, about 11 mm thick
- Dial: sunburst blue, white numerals and hands, date at 3 o'clock
- Movement: caliber 35111, automatic, 42-hour power reserve
- Crystal: sapphire with anti-reflective coating on both faces
- Case back: solid steel with the Le Petit Prince engraving
- Water resistance: 6 bar
- Strap: Santoni leather or steel bracelet, 20 mm lugs
Before You Start
- A jeweler's loupe or a phone macro lens
- A digital scale accurate to 0.1 g
- A caliper or a ruler with millimeter marks
- Bright angled light and a dark background
- The seller's photos of the case back, movement, and papers
Step-by-Step Authentication
- Measure the case across the 9 and 3 positions with the caliper. The reading must land at 40 mm, with a shell near 11 mm.
- Weigh the watch on the scale. A real steel head on leather sits in a narrow band; fakes with plated brass or thin cases come in light.
- Examine the dial printing under the loupe. The “IWC” logo, “SCHAFFHAUSEN”, and “AUTOMATIC” must be sharp, flat, and spaced with even gaps.
- Inspect the date window at 3 o'clock. The genuine aperture has a beveled edge with the date sitting centered and flush; fakes show a raised rim or drifting print.
- Check the hands and lume. Genuine hands are polished on the sides, matte on top, and filled to the same level; fakes show uneven filler and blunt tips.
- Turn the crown through ten full winds. Genuine caliber 35111 feels smooth with a firm stop; clones feel gritty or spin without resistance.
- Flip the watch and study the case back engraving. The Little Prince figure and text must have sharp edges and consistent depth, not a shallow laser outline.
- Ask a watchmaker to open the case. A real 35111 shows Geneva stripes, blued screws, and a signed rotor; fakes show a bare, unsigned movement.
- Match the engraved serial number to the warranty card, box label, and invoice. Numbers that disagree mean the watch or the papers is fake.
- Compare the asking price with current listings for the reference. Deals far below the market band for a complete set are the oldest warning sign there is.
Red Flags That End the Deal
- Seller refuses an in-person or watchmaker inspection
- Case back screws that are mismatched or chewed
- Dial text that is blurry, thick, or touching the markers
- Box and papers printed on thin stock with wrong fonts
- Crown that sits proud of the case or wobbles
- Lume that glows green instead of the correct blue-white
If You Already Bought One
Stop wearing the watch and photograph every angle before you contact the seller. Save the listing, the chat history, and the payment record. File a dispute with your card issuer or payment platform and mention the reference number IW327012 in writing. An authorized service center can confirm the movement and serial in a written statement, which is the document most dispute teams ask for.