Answer First

A replica IW371647 is only worth buying if it copies four things: the 41 mm case with a 13 mm profile, the vertical subdial layout with elapsed minutes at 12 and running seconds at 6, a chronograph that starts and resets without lag, and dial printing that sits flat and sharp under a loupe. Everything else, from rotor decoration to strap stitching, is secondary. If a seller cannot show you a running chronograph video and a caliper photo of the case, walk away.

What the Genuine Watch Sets as the Standard

The IW3716 family runs the in-house 69355 calibre, a column wheel chronograph with a 46-hour power reserve and a 4 Hz beat rate. The case is steel, 41 mm wide, roughly 13 mm thick, with a sapphire crystal and a display back. The dial is clean: two subdials stacked on a vertical axis, a date window at 3, leaf-shaped hands, and applied numerals. Use these numbers as your measuring stick before you look at any listing.

Prerequisites

  • Digital calipers, or a ruler and a steady hand
  • 10x loupe or a phone macro lens
  • Reference photos of the genuine dial and caseback
  • A stopwatch or phone timer to test chronograph accuracy
  • Seller video showing the chronograph running and resetting

How to Evaluate the Copy

  1. Measure the case across the bezel at 4 o'clock to 10 o'clock. Accept 40.8 mm to 41.2 mm. Reject anything under 40 mm, which means a 38 mm mid-case was used.
  2. Measure case thickness from the crystal top to the caseback. Expect 13.0 mm to 13.6 mm. A thin copy used a quartz movement and will read under 11 mm.
  3. Look at the subdial positions. The 12 o'clock subdial must sit on the same vertical line as the 6 o'clock subdial, with the crown at 3. Any horizontal offset means a wrong dial blank.
  4. Start the chronograph and watch the central seconds hand. It should start with no stutter and sweep in small, even increments.
  5. Run the chronograph for 60 seconds, then check that the 12 o'clock counter has advanced one full mark. A counter that jumps late or drifts is a cheap module.
  6. Press reset and confirm both the central hand and the minute counter snap back to zero at the same moment. A slow crawl back to zero is an instant reject.
  7. Check the 6 o'clock subdial. It is running seconds on the genuine watch, so the hand must move at all times, not only when the chronograph runs.
  8. Pull the crown to position one and cycle the date. It should click over with a firm detent, and the date should sit centered in the window with even margins.
  9. Inspect the dial under the loupe. Printing on the numerals and the brand text should be raised and crisp, with no ink bleed, no fuzzy edges, and no gaps between applied markers and the dial surface.
  10. Check the hands. The leaf hands should be flat, with a clean center crease and no tool marks at the pinion. Bent or brushed hands point to a low-tier build.
  11. Look at the crystal edge from the side. A domed or thick edge with a visible white rim means a generic sapphire was fitted instead of a correctly profiled one.
  12. Turn the watch over and read the caseback engraving. Letters should be cut, not printed, and the reference text should be spelled correctly with even spacing.
  13. Time the movement over 24 hours against a reference clock. Accept plus or minus 15 seconds per day for a replica-grade movement. Anything worse needs a regulation service.
  14. Ask the seller directly about water resistance. Treat any dive or shower use as off limits unless the case was pressure tested, since ISO 22810 testing is not performed on replica cases.

Flaws That Signal a Cheap Build

Reject a copy with subdials that are printed rather than recessed, a date window with a visible white plastic ring, a chronograph pusher that feels spongy or grinds, or a caseback that shows a plain undecorated rotor through the sapphire. Also reject any listing that avoids straight-on dial photos, since a straight-on shot is the fastest way to spot misaligned markers.

What No Replica Gets Right

Movement finishing on the 69355 is done to a standard that replica factories do not match. Expect the bridges and rotor to show machine-applied stripes rather than hand-finished anglage, and expect the column wheel to be a cam on lower-tier builds. Buy the replica as a visual stand-in, not as a substitute for the real watch, and set your budget with that limit in mind.