A fake IWC titanium watch is often a steel case with a grey coating. Real titanium has a density of 4.51 g/cm3. Steel 316L has a density of 8.0 g/cm3. A titanium case weighs about 45 percent less than the same case in steel. That gap is the fastest test.
Quick answer
Weigh the case. Titanium reads 4.51 g/cm3 and steel reads 8.0 g/cm3, so a real titanium 40 mm case lands near 40 g. A steel case with a titanium look lands near 70 g. Then check the finish, the caseback engraving, and the movement.
What IWC uses
IWC builds titanium cases from grade 5 titanium, also called Ti-6Al-4V. Grade 5 has a yield strength near 830 MPa. Grade 2, the softer commercial grade, sits near 275 MPa. Titanium is paramagnetic, so it does not hold a magnet. Note that annealed 316L shows weak attraction and cold-worked steel shows more. A magnet alone does not prove titanium.
Reference example: the Pilot's Watch Mark XVIII Titanium carries reference IW327006. Check that number against the IWC catalog before you trust a listing.
Weight test
- Use a 0.1 g scale. Weigh the head without the strap.
- 40 mm titanium head: about 38 g to 45 g.
- 40 mm steel head: about 65 g to 75 g.
- Full titanium bracelet, 40 mm: about 55 g to 70 g. Steel: about 110 g to 140 g.
A coated steel case sits within a few grams of the steel figure. That is the tell.
Finish and wear
IWC titanium cases get a bead-blasted or brushed matte grey finish. Titanium is the color through the whole case, so a scratch stays grey. Titanium scratches more than steel because surface hardness is lower. A PVD or DLC coated steel case shows bright silver at scratch edges, on the clasp, and on the crown threads.
Caseback and engraving
Look at engraving depth. IWC stamps or laser-engraves deep marks with clean edges. Replica casebacks often carry shallow laser marks. Check font weight, the spacing of the reference number, and the material marking. Titanium is not hallmarked, so a TITANIUM stamp proves nothing on its own.
Movement
IWC uses in-house calibres, including the 32110 and the 82000 series. Many replicas use decorated ETA 2824 clones or Seagull ST movements. Check the beat rate: 28,800 vph on the ETA base, 21,600 vph on several Seagull calibres. Look at rotor engraving, jewel count, and movement ring fit. A decorated rotor over a stock movement is a common sign.
Tests at home
- Weigh the case and compare with a steel model of the same size.
- Ask a jeweler for an XRF reading. Titanium reads as Ti. Steel reads as Fe with Cr and Ni.
- Check scratch color under a loupe. Grey through the metal means titanium. Silver under grey means coating.
- Check bracelet screws. Titanium screws are lighter and softer. Steel screws inside a titanium bracelet are common on replicas.
Limits
XRF measures the surface. A steel case with a titanium-rich coating can read as Ti on some handheld units. Density testing needs case volume, which is hard to measure on a built watch. No single test settles it. Two or three together do.