The short answer
A replica IW371487 is a copy of IWC's Portugieser Chronograph: a 41 mm steel watch with a clean two-register dial and leaf-shaped hands. The copies worth owning run an automatic chronograph movement, keep the 30-minute counter at 12 and the small seconds at 6, and wear close to the real thing. The ones worth avoiding run quartz, sit 2 mm too thick, and fall apart the moment someone looks at the dial from an angle. Expect to pay $250 to $450 for a version that holds up, and accept up front that no copy matches the original's case profile exactly.
What the original watch is
The reference belongs to the 3714 family of Portugieser Chronographs, a line that started in 1998 and has barely changed its face since. Figure roughly 41 mm across, about 12.5 mm thick, sapphire front and back, 30 m of water resistance, an alligator strap, and IWC calibre 79350 inside, which is a heavily reworked Valjoux 7750. Newer 3716-generation watches swap in the in-house 69355.
The layout carries the whole design. Applied Arabic numerals, feuille hands, a 30-minute totalizer at 12, small seconds at 6, no date window anywhere. That symmetry is why the watch gets copied so heavily, and it is also why sloppy copies stand out instantly: any error in the dial gets amplified by how empty and balanced the real one is.
Movements you will actually find
- Quartz. The bargain tier. The subdial at 6 usually ticks once per second as a running second hand, the pushers feel dead, and the chronograph seconds hand stutters instead of sweeping.
- Asian 7750 automatic. The standard for anything serious. Correct subdial placement, a sweeping chrono hand, real pusher resistance. This is the version to look for.
- Decorated 7750. Same base, better finishing and engraved bridges visible through the caseback. Only worth the premium if the case and dial are equally good.
What I check first
- Thickness. Original is about 12.5 mm. Most automatic copies land between 13.5 and 14.5 mm. Side by side it shows. On the wrist, in normal life, it mostly does not.
- Subdial positions. On a correct dial the 12 and 6 registers hug the center. Cheap cases push them toward the edge and the whole face looks stretched.
- Dial printing. Look hard at the brand name and the city line. Thick, fuzzy, or uneven lettering means a cheap dial, and nothing else on the watch can save it.
- Hands. Feuille hands should read as blued or heat-treated steel with a clean center sweep and no paint bleed at the tips.
- Crystal. A domed sapphire with inner anti-reflective coating is the target. If the dial washes out the moment you tilt it toward a window, keep looking.
- Caseback and strap. Engraving should be crisp and shallow rather than stamped and deep. Strap stitching should be tight and even, with no glue visible at the lugs.
Price bands and what you get
Quartz copies sit around $80 to $150 and are costume jewelry with a battery. Automatic 7750 copies run $250 to $450 and are the sweet spot. Above that, you are paying for dial and case refinement, and the returns shrink fast. Below $200 with an automatic movement advertised, assume something is being misrepresented.
Things no copy gets right
Movement finishing, engraved rotor detail, the exact sheen of the dial lacquer, and the caseback engraving depth. Resale value is zero, and a chronograph service on an Asian 7750 can cost a meaningful share of what you paid. Buy it as a watch to wear, not to flip.
Bottom line
Judge the replica IW371487 on three things: subdial placement, case thickness, and dial printing. Get those right and you have a watch that reads correctly on the wrist from a normal distance. Get them wrong and no movement upgrade will hide it.