Quick answer

A replica IW371493 is a copy of the IWC Portugieser Chronograph with a blue dial and a stainless steel case. The versions worth buying run about $260 to $600. Good examples use a case near 41 mm wide, a working chronograph with the minute counter at 12 and running seconds at 6, sapphire glass on the front, and a decorated automatic movement built to resemble the IWC calibre 69355. Anything under roughly $120 usually carries a stamped dial, a rotor you can hear across a room, and hands that sit off the markers.

Prerequisites

  • A firm budget, because the gap between a $150 copy and a $450 copy shows up on the wrist within a week.
  • Five to ten reference photos of the genuine IW371493 saved on your phone for side-by-side checks.
  • A ruler or digital caliper to verify the case diameter when the watch arrives.
  • A 10x loupe or a phone macro lens for dial and hand inspection.
  • A seller who will send QC photos before the parcel leaves the workshop.

1. Confirm the reference details before you pay

The IW371493 sits in the Portugieser Chronograph family. The original measures about 41 mm across, roughly 12 to 13 mm thick, and uses an in-house automatic chronograph with a 46-hour power reserve. The dial is blue with a sunburst finish, applied Arabic numerals at 12 and 6, leaf-shaped hands, a date aperture at 3, and two recessed subdials. Water resistance on the genuine is modest, so treat any replica as splash-only no matter what the listing claims. Write those numbers down and compare them against the listing text. Sellers who list a 44 mm case or a quartz movement are selling a different watch with the same name.

2. Choose the movement tier

  1. Ask the seller to name the base movement in writing before you order.
  2. Reject quartz outright, because a ticking seconds hand breaks the illusion on a chronograph.
  3. Accept a modified Asian 7750 or a Seagull ST19 only if you plan to wear the watch a few days a week.
  4. Pay the premium for a clone-style automatic with a column-wheel layout if you want the pushers to feel crisp.
  5. Confirm the chronograph runs, resets to zero, and the date flips cleanly before you approve shipping.

What each tier gets you

  • Budget tier: rough rotor noise, soft pushers, subdial hands that drift.
  • Mid tier: smooth sweep, acceptable pusher feel, serviceable parts.
  • Top tier: decorated bridges, engraved rotor, pushers with a defined click, and a 40-hour-plus reserve.

3. Inspect the dial

  1. Check that the subdials sit on the same horizontal axis as the genuine, with the minute counter at 12 and the running seconds at 6.
  2. Look at the printed text under the 12 marker and confirm the spacing matches your reference photo.
  3. Study the applied numerals for thickness and polish on the edges rather than flat chrome plating.
  4. Compare hand length, since short hands are the most common shortcut on cheap copies.
  5. Verify the date window sits at 3 and that the font is not oversized or bold.

4. Examine the case and crystal

Run a fingernail along the lug edges. A good case has a crisp break between the brushed flank and the polished bevel. A cheap case feels rounded and soft because the finishing was done by hand on a buffing wheel. Check that the crystal sits flush with the bezel and that the anti-reflective coating is present but not blue-tinted from an angle. Crown guards should be symmetrical, and the crown itself should screw down without grit.

5. Check the strap and clasp

The IW371493 usually ships on an alligator-pattern leather strap with a steel pin buckle or deployant clasp. Ask for photos of the stitching density and the buckle engraving. Thin, plasticky leather and shallow engraving are the two fastest tells on a wrist check. Confirm the lug width, commonly 20 mm on this family, so you can swap in a third-party strap without gaps.

6. QC photo checklist before shipment

  1. Request a straight-on dial shot in daylight, not a studio render.
  2. Request a caseback shot showing the movement through the display back.
  3. Request a timed photo of the chronograph running and reset.
  4. Request a side profile shot to judge case thickness.
  5. Request the actual weight on a scale, since hollow cases feel wrong on the wrist.
  6. Ask for a short video with sound so you can hear the rotor.

7. Red flags

  • Stock manufacturer photos instead of photos of the actual unit.
  • A price far below the tier you selected, with no explanation.
  • Claims of genuine Swiss movement in a sub-$200 watch.
  • No return window and no confirmed shipping method.
  • Listings that copy the reference number but show a plain dial with no subdials.

8. What no replica gets right

The movement finishing under the display back will never match an in-house IWC calibre, and the rotor engraving is always a little shallow. Case profile on a macro level is close but not identical, and the strap leather is a step down. Judge the watch at arm's length and in normal light. If it holds up there and the chronograph works, it does the job the reference was bought for.