Short answer
The reference IW544705 is an IWC Portugieser Tourbillon Hand-Wound in platinum. Catalog data puts the case at 43 mm, hand-wound, with a flying tourbillon at 6 o'clock and small seconds on the same axis. IWC built it in a small limited run. A clone is a third-party copy sold as 1:1 or first copy. Working tourbillons exist in the replica trade, but the cage, the finishing, and the calibre do not match IWC. Sellers reuse this reference number on different builds, so confirm each spec on the listing before you pay.
What the reference actually is
- Case: platinum, 43 mm, polished bezel, stepped lugs
- Dial: silver plated, applied numerals, railway minute track
- Movement: hand-wound IWC calibre 98900, flying tourbillon, small seconds
- Production: limited, numbered on the caseback
Verify these against IWC's own reference page. Auction and resale listings swap details, and some sellers attach the number to plain Portugieser automatics.
Fake IW544705 Watch Buying Guide
The movement decides the price
Three tiers show up under this reference. The first has a printed or screwed-on bridge shaped like a tourbillon cage and no rotating part. The second has a real Chinese tourbillon, often based on a Seagull or Hangzhou design, with a cage that spins once per minute. The third has a real tourbillon plus decoration shaped to look like IWC finishing. Tier one is the most common at low prices. Ask for the movement name and a video with the seconds hand running and the caseback off.
Case, weight, and dial checks
- Platinum is dense. A steel or plated case feels light in the hand for its size.
- Check lug shape, crown size, and the step between bezel and case band.
- Dial printing: the railway track should be thin and even. Thick or broken lines point to a cheap print.
- Tourbillon aperture: the opening edge should be clean and hand-finished on the original.
- Caseback engraving: limitation numbers sit in a fixed format, not a loose script.
Vetting steps
- Ask for the exact reference on the caseback photo, not just the seller title.
- Ask for macro photos of the dial, the tourbillon bridge, and the caseback.
- Ask for a 30-second video: seconds hand moving, crown turning, rotor absent on a hand-wound build.
- Ask for timegrapher numbers: rate, amplitude, beat error.
- Ask about service: who repairs a Chinese tourbillon if it stops.
What no clone delivers
No replica matches platinum weight, IWC movement architecture, or the original finishing under a loupe. Water resistance is unstated on most builds. There is no IWC warranty and no factory parts channel. Resale value drops fast. Treat the watch as a costume piece and price it that way.
Questions to send a seller
- Which movement is inside, and who makes it?
- Is the case solid platinum, steel, or plated?
- Does the tourbillon cage rotate once per minute?
- What is the measured case diameter and weight?