The best replica IW371433 for most buyers is a 41 mm stainless steel automatic copy with a working two register chronograph, a sapphire crystal, and a silver or white dial with applied Arabic numerals and leaf hands. Every option below was judged on four points: how close the case profile sits to the genuine Portugieser Chronograph, whether the subdials move like the real layout, how the dial print and hands read at arm's length, and how much proof the seller shows before the watch ships.

Baseline specs you are matching

The IW371433 sits inside the IWC Portugieser Chronograph family, so fix these numbers in your head before you compare listings:

  • Stainless steel case, about 41 mm wide and about 13 mm thick
  • Two register dial: small seconds at 6 o'clock, 30 minute counter at 12 o'clock
  • No date window, so any copy with a date at 3 o'clock is the wrong watch
  • Slim bezel, domed sapphire crystal, leaf hands, applied Arabic numerals
  • Alligator style strap with a tang or folding buckle

A copy that misses the case size or adds a date fails at the first glance. Nothing else in the build can rescue that.

Option 1: Automatic copy with a reworked chronograph movement

This tier gets the closest to the reference. The original runs an automatic chronograph movement with the running seconds at 6, and the better copies rework a 7750 style movement to move the small seconds to 6 as well. Ask the seller for a dial photo with the chronograph running, because a stock movement keeps its small seconds at 9 and that placement is an instant giveaway.

Pros

  • Subdials sit where the reference puts them, so the dial reads correct from across a table
  • Sweeping chronograph hand, mechanical rotor noise, and case weight that feels like the real thing
  • Pusher action and reset behave like a proper chronograph movement

Cons

  • Thicker than the reference in most builds, often 1 to 2 mm over
  • Needs service at some point, and the chronograph side is the costly part
  • Higher price than quartz tiers, with more unit to unit variation

Choose this tier if you wear the watch often and want the subdial layout to survive close inspection.

Option 2: Quartz chronograph copy

The budget path, and the one most first time buyers start with. The case can be built thin, the watch keeps time without winding, and the pushers reset in one push.

Pros

  • Accurate timekeeping with no winding or service
  • Case thickness can come closer to the reference than the automatic builds
  • Lowest cost, so a spare strap or a second dial color fits the same budget

Cons

  • The small seconds hand ticks in one second jumps, which is the loudest tell on this reference
  • Caseback has no rotor, and the weight in hand feels light
  • Pusher feel is soft, and dial print on this tier is often muddier

Good for occasional wear, for testing whether you enjoy a 41 mm case, or for a costume or photo build where nobody handles the watch.

Option 3: Hand wound mechanical chronograph copy

A middle path for people who want mechanical feel without automatic thickness.

Pros

  • Sweeping seconds and a slim, light case on the wrist
  • No rotor, so nothing spins when you move your arm
  • Crisp pusher feel on the better examples

Cons

  • Common hand wound chronograph movements put running seconds at 9, not 6, so the layout is wrong
  • You wind it every morning
  • Caseback view differs from the automatic reference

Pick this one only if you accept the layout compromise in exchange for the winding ritual and the slimmer profile.

Details that decide the purchase

  1. Crystal and coating: a flat uncoated crystal flattens the dial. Request a side shot with light hitting the glass.
  2. Dial furniture: numerals should be applied metal, not flat paint, and the leaf hands need sharp edges.
  3. Subdial rings: they should sit below the dial surface with a crisp step, not printed on top of it.
  4. Case flanks and lugs: the reference lugs curve down with a polished bevel. Straight slab lugs read as a cheap case.
  5. Strap: confirm the exact strap in your order, because many sellers ship a generic grained strap that does not match the sample photos.
  6. Movement proof: a short video of the sweep plus chronograph start, stop, and reset.

How to vet a seller before you pay

Ask for a quality control album with a dated card, natural light photos, and one wrist shot. Get the return window in writing and pay through a method that gives you some recourse. A seller who will not send a video of the chronograph running is telling you something about the watch.

Which copy fits how you wear it

  • Daily wear: automatic tier in the silver dial, with a spare strap on hand
  • Weekend and dinners: quartz tier in the white dial, since it keeps time and costs less to replace
  • Photos and display: automatic tier again, because the subdial layout is what shows in a still shot
  • First mechanical watch or a gift: hand wound if you like winding, quartz if you do not