Short answer
The fastest tell on an IW371414 is the dial layout. The genuine IWC Portugieser Chronograph ref. 3714 has two subdials, a 30-minute counter at 12 o'clock and running seconds at 6, and no date window. See a date at 3, or counters sitting at 3 and 9, and you are not looking at a 3714 no matter what the caseback says. Everything after that, case profile, crystal, chronograph feel, movement finish, is confirmation.
Dial and printing
Get a loupe on the dial first. Genuine printing is crisp and even in weight. The IWC signature, SCHAFFHAUSEN, and the small text around the subdials all hold a hard edge at 10x. Copies tend to run fat and slightly fuzzy, with spacing that drifts from word to word.
Best Alternatives to the Fake IW371414 Watch
The dial finish should read evenly under angled light. Silver-plated or slate variants show no blotching, no orange-peel texture, no patchiness around the subdial rings. Numerals that should be applied sit proud of the surface and catch light with a small shadow behind them. Flat printed numerals are a warning sign. Hands matter too: the leaf shape should be symmetrical, with polished bevels that shift from dark to bright as the watch turns.
Case and crystal
Ref. 3714 measures roughly 40.9 mm across and about 12.3 mm thick. That thinness is hard to fake, because the movement has to fit inside. Many copies run one or two millimeters thicker and sit higher on the wrist. Look at the lugs: on the real one they taper and curve down in one smooth line, and the polished flank meets the brushed top with a straight, clean edge. On copies, the transition wanders and the lug tips feel sharp against a thumb.
Tilt the watch under a lamp. The sapphire should be close to invisible from most angles, with a faint blue-violet flare from anti-reflective coating on both sides. A strong blue tint, or a crystal that behaves like a mirror, points to single-side coating, which is common on replicas.
Chronograph and crown
Push the chronograph. On a healthy 79350, the pushers travel short and firm with an audible click, and reset snaps both hands back hard. Mushy pushers with a long throw, or a reset that dribbles back toward zero, suggest an unmodified 7750 or a cheap clone. Wind the crown and set the time: the action should feel tight and precise, not gritty, and the crown should seat against the case without a visible gap.
Ignore one piece of forum advice. The rotor wobble people cite as proof of a fake proves nothing. Calibre 79350 is built on the Valjoux 7750, so the real watch wobbles on the wrist as well.
Movement and engraving
IWC calibre 79350 runs at 28,800 vph with a 44-hour reserve and a 30-minute chronograph counter. Through the back you want even striping on the rotor and bridges, blued screws with clean slots, and engraving cut with sharp edges rather than stamped and shallow. Caseback text should be crisp, correctly spaced, and consistent with the reference and serial format used in that production year.
Papers, price, and seller behavior
Documentation and price tell you as much as the watch does. A steel 3714 with box, booklets, and a stamped warranty card sells in a well-known range. An unboxed example at a fifth of that, described as new old stock, is either counterfeit or comes with a story. Ask for a short video of the chronograph running, a clear caseback photo, and the serial before you commit. A seller who dodges those requests has already answered your question.
Quick checklist
- No date window anywhere on the dial
- Subdials at 12 and 6, not 3 and 9
- Thickness near 12.3 mm, not 13 to 14 mm
- Sharp printing under magnification, even stroke weight
- Short, firm pusher travel and a hard reset to zero
- Cut engraving on the movement, not shallow stamping
- Serial and reference format that matches the era
- Papers and price in line with the real market
One honest note
A replica sold as a replica and a counterfeit sold as genuine are two different problems. Most of the frustration around this reference comes from the second case, where someone pays genuine money for a watch that never came from Schaffhausen. Learn the dial, learn the thickness, learn the pusher feel, and you can usually sort one from the other in under a minute.