The short answer: a replica IW371497 is worth buying only if it gets three things right. The dial must have two subdials and no date window. The case must sit close to 12.5 mm thick, not 14. And the movement should be a chronograph calibre with the running seconds at 6 and the chrono minutes at 12, matching the genuine layout. Miss any of those and you are paying for a watch that does not look like the real Portugieser to anyone who knows the reference.
What the reference actually is
The IW371497 sits inside the Portugieser Chronograph family, IWC's long-running steel chrono with a clean, almost austere dial. You get a 40.9 mm steel case, leaf-shaped hands, applied Arabic numerals, a railway minute track, and sapphire on both sides on later production. Earlier versions of the family used a modified Valjoux base. Later ones moved to an in-house calibre, which changed the caseback from solid to exhibition. If a seller cannot tell you which era their replica copies, that is your first warning sign.
The dial is where most copies fall apart
I look at the printing first. On a good copy the minute track is thin and even, the numerals sit flat against the dial with no shadow gap, and the subdial rings are concentric rather than stamped and sloppy. The subdial spacing matters more than people expect. Replicas built on a 7750 base often push the subdials slightly wider or narrower than the genuine, and once you see it you cannot unsee it.
- No date aperture. The genuine 3714 family has none, so a date window is an instant fail.
- Leaf hands with a clean centre crease, not flat stamped blades.
- Correct hand colours: blued or gold-plated depending on the dial variant.
- Applied numerals, never printed or glued-on stickers with visible edges.
Case, thickness, and finish
Thickness is the giveaway nobody hides well. A chronograph module adds height, and cheap builds land closer to 14 mm than the genuine's 12.5 mm. On the wrist that extra millimetre and a half reads as a chunkier watch. Look at the lug profile too. The Portugieser lugs are slim and curve down sharply; copies with thick, blocky lugs look wrong from every angle. Brushed surfaces should be fine and directional, polished bevels crisp, and the caseback engraving sharp rather than sandblasted into mush.
Movements you will meet
Most replicas of this reference run one of three things. An Asian 7750 derivative is the common option: reliable enough, serviceable, but thicker and noisier with a rotor you can hear across a quiet room. A cloned or decorated in-house-style calibre costs more and looks better through a display back. Quartz versions exist and are easy to spot because the chrono hand ticks instead of sweeping. Ask for a movement photo, a timing reading, and whether the chronograph resets to zero cleanly. That reset test catches a lot of bad builds.
What to ask before you pay
- Exact case diameter and thickness in millimetres, measured, not quoted from a listing.
- Movement name and a clear photo of the rotor and balance area.
- Water resistance claim, and whether the caseback gasket is actually fitted.
- Strap or bracelet options, since the genuine is usually sold on leather.
- Return policy in writing if the chrono does not reset properly.
Price expectations
Entry-level copies of this reference land around the low hundreds of dollars and feel like it. A solid mid-tier build with a decent 7750 and proper dial printing runs a few hundred more. Anything above that should come with a decorated movement, correct thickness, and real sapphire. If a seller quotes genuine-adjacent money for a watch with a stamped dial and a 14 mm case, walk away.
Bottom line
Buy the dial and the case profile, not the badge on the rotor. A replica IW371497 with correct proportions and clean printing will fool almost anyone at arm's length. One with a date window never will.