Short answer
The replica IW371490 you will find in the market is a copy of IWC's Portugieser Chronograph in stainless steel: about 40.9 mm across, two subdials, applied numerals, leaf hands, sapphire on top. Case and dial work on the better examples is genuinely close to the real thing. The movement is where the gap lives. Nobody ships IWC's calibre 79350, so you get a modified 7750 style automatic, a hand wound Seagull ST19, or a decorated clone. Decide which of those you can live with, then buy on dial accuracy and case dimensions.
What the reference actually is
IW371490 belongs to the Portugieser Chronograph line, the watch IWC has sold in one basic silhouette for a very long time. The family spec sheet reads much the same across it: 40.9 mm steel case, roughly 12.5 mm thick, sapphire front crystal with anti reflective coating, 30 m water resistance, and a two register dial with chronograph minutes at 12 and running seconds at 6. The 3714 generation used calibre 79350, a 7750 derivative running at 28,800 vph with about 44 hours of reserve. Later versions moved to the 69355. If you are chasing the exact dial color and hand combination tied to this suffix, verify it against IWC's own reference page before you compare reps, because sellers blur suffix codes badly.
What replica makers got right
Case profile, bezel step, lug curve and crown shape are all well understood now. On the higher tiers the dial is the strong point: sunburst or matte finishing depending on the variant, a printed minute track that holds up under a loupe, and subdial rings that are recessed rather than flat printed. Strap hardware is usually fine, and most arrive on decent leather with a clasp that resembles the original pin buckle or deployant.
Where they cut corners
Subdial spacing is the classic tell. On a genuine 79350 the two registers sit at a particular distance from the center; a 7750 based copy often pushes them slightly wider. Thickness is the second tell, since a stacked chrono module adds a millimeter or more and the caseback sits proud on the wrist. Third is the caseback engraving, often too shallow with the wrong reference font. Lume is the weakest point on nearly every replica.
Movement tiers
- Entry (roughly $120 to $200): quartz or a low grade automatic, printed subdials, mineral glass, obvious thickness.
- Mid (roughly $250 to $380): A7750 based automatic, sapphire crystal, better dial printing, closer case dimensions, still a touch thick.
- High tier (roughly $450 and up): the closest case and dial work, correct subdial placement, sometimes a hand wound ST19 instead of an automatic, with decorated bridges if the caseback is a display type.
Pre-purchase checklist
- Confirm the dial color and hand set against the real reference, not the seller's product title.
- Ask for the measured thickness, not the claimed one.
- Ask which movement it is, and whether the subdials actually function or are decorative.
- Study the date window position and font in a close up photo.
- Check that the chrono hands reset to zero cleanly.
- Confirm lug width (20 mm on this family) and whether the clasp matches the version you want.
Living with it
Do not swim in it, and do not trust a stated 30 m rating on any replica. The gaskets are the cheapest part in the build. Have a watchmaker pressure test it if water contact matters, or simply treat it as a dry weather watch. A 7750 based copy benefits from one service if you plan to wear it hard. The ST19 is simpler but hand wound only, and it will not survive being forced past its stop.
Quick answers
Is a replica IW371490 worth it?
If you want the silhouette and the dial legibility without spending five figures, yes. If you want the movement, no. That trade is the whole decision.
Which version is closest?
The top tier with sapphire crystal, correct case thickness and working subdials. Dial accuracy beats movement decoration every time, because the dial is what people actually see.