The IW371416 is a Portugieser Chronograph: a 40.9 mm steel case, a silver-plated dial, a 30-minute counter at 12, small seconds at 6, and IWC's calibre 79350 inside. A good replica of this reference nails the dial layout and the case profile. A bad one gets the thickness wrong, spaces the subdials badly, or prints the markers too heavy. Those are the three things I look at before anything else.
The short answer
Buy the version with a working chronograph driven by an Asia 7750, not the quartz ones. Expect the case to run a little thicker than the genuine 12.3 mm, usually 13.5 to 14 mm. Check that the subdials sit at 12 and 6 with a clean gap between them and that the running seconds hand at 6 sweeps rather than ticks. If the subdial at 12 tracks elapsed minutes when you start the chrono, the movement is doing its job.
What the genuine watch does
- Stainless steel case, 40.9 mm across, roughly 12.3 mm thick
- Calibre 79350, a modified Valjoux 7750 base, 28,800 vph
- Chronograph minutes at 12, running seconds at 6
- Applied numerals and feuille hands, silver-plated dial
- Sapphire crystal, display back on most versions
- 30 m water resistance, which is modest even on the original
That movement layout is the whole reason this reference is easy to fake badly. A 7750-based replica copies the subdial positions naturally. A quartz replica fakes them, and it shows the moment you press the pushers.
Dial details that separate the tiers
The Portugieser dial looks simple, which is exactly why small errors stand out. On the better replicas the numerals are applied, not printed, and they sit slightly proud of the surface with crisp edges. The minute track should be thin and even, with no blurring where the printing meets the chapter ring. Look at the lettering under 12: it should be sharp, correctly spaced, and not crowded against the markers.
Hands matter too. The feuille shape needs a proper taper, and the blue version of the hands should look deep rather than painted-on. If the seconds hand at 6 wobbles or stutters when the watch is running, walk away.
Case, thickness, and caseback
This is where most replicas give themselves away on the wrist. The genuine case is slim and the lugs curve down early. A 7750 replica will always be a bit thicker, but the better batches keep it under 14 mm and shape the caseback so it sits flat. A domed, bulbous caseback pushes the watch up off the wrist and makes it look bigger than 40.9 mm.
Check the engraving on the back. Deep, clean lettering with correct spacing is a good sign. Laser-etched text that looks grey and shallow is not.
Strap and clasp
Most of these ship on an alligator-grain leather strap. The strap is the cheapest part of the package on nearly every replica, and it is also the easiest thing to replace. I would rather have a solid case and a mediocre strap than the reverse. Look for stitching that runs straight, a strap that tapers properly toward the buckle, and a pin buckle with a clean stamped logo rather than a cast blob.
Price tiers, roughly
- Under $150: usually quartz, wrong thickness, printed dial furniture. Skip it.
- $250 to $400: Asia 7750, decent dial, average strap, occasional QC issues
- $400 and up: better case finishing, applied numerals, cleaner printing, nicer strap
Pay more for the dial and case, not for a fancy box.
Red flags
- Pushers that feel mushy or do nothing when pressed
- A seconds hand at 6 that ticks once per second
- Subdial spacing that crowds the centre pinion
- Photos that avoid the side profile and the caseback
- Sellers who quote a thickness but will not show a caliper shot
Living with it
Treat 30 m water resistance as splash-only, on the replica and on the original. Keep the chrono running sparingly; the 7750 layout puts load on the movement and the power reserve is not generous. If it starts losing time badly, a service costs more than the watch in most cases. Buy it as a look, wear it carefully, and do not expect genuine-watch reliability.