Short answer
IW544761 is an IWC Portuguese Tourbillon Mystère reference. A genuine one is a hand-wound watch in platinum or gold with a flying tourbillon and a seven-day power reserve. Prices for real examples sit in the tens of thousands of dollars and up. Most watches listed online as "IW544761" for $150 to $900 are copies. The copies do not contain a working flying tourbillon.
What the reference is
IWC reference numbers carry six digits after the prefix. The first four identify the model family and complication. The last two identify case metal and dial variant. So IW544761 is one configuration of the Portuguese Tourbillon Mystère line, not a separate model.
Traits IWC lists for the line:
- Hand-wound movement. No rotor.
- Flying tourbillon. The cage makes one turn per minute.
- Seven-day power reserve, 168 hours, per IWC specifications.
- Case diameter near 44 mm. Confirm the exact figure against the spec sheet for the suffix.
- Domed sapphire crystal with anti-reflective coating on both faces.
IWC does not publish an archive page for every suffix. If a seller cannot show a case number, a reference, and a service record that match, treat the suffix as unconfirmed.
The tourbillon test
This is the fastest check. On a genuine watch the cage and balance assembly rotate as one unit. Watch it for 60 seconds. It should complete one turn.
Common fakes:
- An aperture with a decorated balance wheel that does not rotate as a cage.
- A small seconds hand with a printed bridge behind it.
- A real Chinese flying tourbillon. These exist, they cost more, and they run at a different beat rate. They are still not IWC.
A true flying tourbillon has no upper bridge. If a bridge crosses the cage on the dial side, the watch is not an IW544761.
Case and dial checks
- Metal stamps. Platinum examples carry PT950. Gold examples carry 750 or the matching hallmark, struck between the lugs.
- Applied indices. Solid gold, set into the dial. Not glued on top with adhesive showing at the edges.
- Printing. "IWC" and "Schaffhausen" are sharp and level. Copies show thick edges and uneven spacing.
- Crystal. Sapphire, domed, coated on both faces. Mineral glass or a flat crystal is a fail.
- Caseback. Reference and case number engraved, not printed. Numbers must match the papers.
Movement checks
Open the caseback or ask for a movement photo.
- No rotor. The watch is hand-wound. A spinning weight means the movement is not original.
- Finishing. Bridges with Geneva stripes, polished bevels, blued screws.
- Engraving on the movement: IWC mark, calibre number, jewel count.
- Power reserve. Wind it fully and set it down. A genuine example runs close to seven days. Most copies stop in 30 to 40 hours.
Price reality
A working tourbillon cannot be built and sold for $300. The parts and assembly time do not allow it. Any listing under $1,000 for an "IW544761" is a copy or a non-running watch with a printed tourbillon.
Real secondary-market prices depend on metal, condition, and box and papers. Check recent results at the major auction houses before you buy.
Where copies show up
- Marketplace listings with stock photos and no case number.
- Sellers who take bank transfer or crypto only.
- Listings where "Swiss made" is the only quality claim.
- Watches shipped from a country other than the seller's stated location.
What to ask a seller
- Case number and reference, photographed on the caseback.
- A 60-second video of the tourbillon cage in motion.
- A movement photo with the caseback removed.
- Service history and the name of the watchmaker.
If any answer is missing, stop.