A fake Top Gun chronograph at 44.5 mm copies the IWC Pilot's Watch Chronograph Top Gun: a black ceramic case, a matte black dial with white markers, two sub-dials at 12 and 6 o'clock, and a day-date window at 3 o'clock. The 44.5 mm number is the genuine case diameter, so a replica sold under that spec should measure the same across the bezel and hold a similar thickness near 15.7 mm. Shoppers who confirm case size, dial lay-out and movement type before paying get a wearable pilot chrono. Shoppers who skip those checks get a 43 mm steel case with a printed dial and a sticker on the back.
What you need before you start
- Digital calipers with 0.1 mm resolution
- 10x loupe or a phone macro lens
- A chronograph timing app
- The reference number you want, such as IW389101 for the black ceramic version
Measure the case first
Case diameter is the easiest claim to test and the most common one to fake. A true 44.5 mm Top Gun style case fills the calipers at the bezel edge, not at the lugs. Measure at three points to catch an oval or machined-off case.
- Open the calipers across the bezel at 12 and 6 o'clock and note the reading.
- Repeat the measurement at 9 and 3 o'clock.
- Measure again at 10 and 4 o'clock to catch a case that is out of round.
- Measure case thickness from the crystal top to the caseback center.
- Weigh the bare watch head on a kitchen scale and compare it with the stated weight.
Check the ceramic case and finish
Genuine Top Gun cases are black ceramic, a hard, slightly porous-looking material with a matte sheen. Replicas often use PVD-coated steel, which feels colder, weighs more and shows a scratch as bright metal under the coating.
- Look at the lug edges for coating chips that expose grey steel
- Check that the case sides are matte and not glossy
- Confirm the crown and pushers are a different shade, since the genuine parts are titanium
- Run a fingernail along the bezel edge for a sharp step or a soft roll-over
Inspect the dial under a loupe
- Check the printed numerals for bleed or double edges at 10x.
- Confirm the sub-dials sit at 12 and 6 o'clock and are recessed, not flat printed discs.
- Look at the day-date window for correct alignment and a clean aperture edge.
- Compare the hand lengths: minute and hour hands should reach their own track marks.
- Check lume color under indoor light for a uniform cream tone, not a patchy yellow.
Test the chronograph
- Start the chronograph and watch the sweep hand for a stutter in the first second.
- Run it for ten minutes and compare the elapsed time against your phone.
- Press stop, then reset, and confirm both counters snap back to zero.
- Press the pushers with the crown screwed down to test for binding.
Identify the movement
Most replicas at this size use an Asian Valjoux 7750 derivative with a 12-hour layout, or a clone of the IWC 69380 family. Ask for a movement photo with the caseback off. A 7750-based build runs at 28,800 vph and gives a smooth sweep. Cheaper quartz or 21,600 vph movements show a visible tick and reset with a jump.
Flaws that mean walk away
- Case measures under 44 mm
- Printed sub-dials instead of recessed counters
- Pushers that feel gritty or do not return
- Day-date wheel that sits off-center
- Caseback engraving with wrong font weight or spelling
Sizing note
44.5 mm with a 15 mm thickness sits large on a wrist under 6.75 inches. Check lug-to-lug length before you buy, since a long lug span pushes the strap ends past the wrist edge and makes the watch look oversized.