Short answer
A fake IW544708 is a counterfeit of an IWC Portuguese tourbillon from the 5447 reference group. IWC does not show a 544708 variant on the catalog pages checked for this guide, so the number itself has to be confirmed with IWC before money changes hands. Three checks catch most fakes: caseback engraving, the tourbillon cage, and movement finish.
Reference and serial numbers
IWC stamps the reference number and a unique case number on the caseback. On the 5447 family the engraving sits close to the rim and the digits are thin. Fakes use laser etching with rounded edges and a number that repeats across many listings. Ask for a photo of the caseback shot at an angle. Then give the case number to an IWC service center. IWC keeps records of the watches it made.
The tourbillon cage
The Portuguese tourbillon models place a flying tourbillon at 12 o'clock. The cage holds the balance and rotates once a minute. Genuine cages show hand-polished bevels, straight graining on the bridges, and screws with polished heads. Stamped fake cages show tool marks, and the balance sits in a fixed bridge that does not turn. If the balance does not rotate with the cage, the watch is not a tourbillon.
Dial, hands and crystal
Check the printing under a loupe. Genuine dials have sharp serifs and even ink. Fakes show thick letters and dots that bleed into the lacquer. Applied indexes sit flush on a real dial. The crystal is sapphire. A key scratch leaves nothing on sapphire and cuts mineral glass, which most fakes use. Some IWC crystals carry an anti-reflective coat on both faces, so look for a blue or purple tint at an angle.
Case and weight
The 5447 line came in steel, white gold, and platinum, depending on the variant. Gold and platinum cases weigh more than steel. Weigh the watch and compare it against a published spec for the exact metal. Fakes cut metal to save cost. Look at the lugs: genuine edges are crisp and the finish changes from polished to brushed along a hard line.
Movement and power reserve
IWC tourbillon calibres in this line are hand-wound with a long power reserve. Wind the watch, set it down, and note when it stops. A fake with a generic movement runs 36 to 40 hours and gains or loses minutes a day. A genuine IWC tourbillon holds a few seconds a day. Check the stated beat rate and reserve on IWC's page for the exact reference.
Papers, box and price
Genuine 5447 tourbillons sell in the five-figure USD range and up at dealers and auction. Offers at a few hundred dollars are fakes. Ask for the warranty card, the box, and service records. Match the card number to the case number. A seller who refuses a video call with the watch running is a seller to avoid.
What to do before buying
- Get the case number and reference from the seller.
- Confirm both with an IWC service center or boutique.
- Ask for video of the tourbillon cage while the watch runs.
- Meet at a watchmaker and have the caseback opened.
- Walk away if the numbers do not match the papers.