A replica IW371640 is a copy of the IWC Portugieser Chronograph from the 3716 reference family, built around a 41 mm stainless steel case, roughly 13.1 mm thickness, and a twin-register dial with subdials at 12 and 6 o'clock. A true 1:1 version pairs a working column-wheel-style automatic chronograph movement with a domed sapphire crystal, applied Arabic numerals, and a correctly engraved caseback. Before buying, verify case diameter, subdial spacing, pusher feel, and crystal clarity, because those four points separate a premium copy from a cheap quartz or thick-cased imitation.
What defines the IW371640 reference?
The IW371640 sits inside the Portugieser Chronograph 3716 line, IWC's dressy two-register chronograph with an in-house 69355 calibre and a 46-hour power reserve. The genuine watch uses a 41 mm steel case, a sunray or silver-plated dial depending on the variant, leaf-shaped hands, and a railroad-style minute track. It has no date window, which makes dial symmetry the single most obvious tell on a bad replica.
IW371640 specs a replica must match
- Case: 41 mm diameter, about 13.1 mm thick, polished and brushed steel surfaces.
- Dial: two subdials, running seconds at 6, chronograph minutes at 12, no date aperture.
- Crystal: domed sapphire, anti-reflective coating on the inner surface.
- Caseback: sapphire display back with reference and movement engraving, or a solid back on older variants.
- Strap: alligator-grain leather with a steel pin buckle, or a steel bracelet with a butterfly clasp.
- Water resistance: rated 30 m on the original, so any copy claiming 100 m is overstating.
Which movement powers a good replica IW371640?
Most mid-tier copies run an Asian 7750 automatic chronograph, a workhorse design that keeps time well but adds thickness if the case is not re-machined. Top-tier replicas use a slimmer modified chronograph module so the profile lands close to the 13.1 mm original and the pushers click with a firm, short travel. If the chronograph seconds hand stutters when you stop it, or the reset does not snap back to zero, the movement is not worth the asking price.
Dial and case finishing checks
Look at the applied numerals first. Genuine-level copies use polished, faceted indices that catch light on the edges; cheap ones use flat stickers or painted markers. Subdial rings should show fine concentric snailing, and the printed minute track should stay crisp under a loupe rather than bleeding into the dial finish. On the case, the lugs should taper smoothly into the strap, with brushing that runs in one direction and no visible tool marks around the caseback lip.
How much should a 1:1 replica IW371640 cost?
Entry copies with a quartz or low-grade automatic movement typically land between 120 and 250 US dollars, and they usually run 1 to 2 mm too thick. Mid-tier automatic versions sell for roughly 250 to 400 dollars. The best 1:1 grade, with a sapphire crystal, decorated movement, and accurate dial printing, sits near 400 to 650 dollars depending on the strap upgrade.
Frequently asked questions
Does the replica IW371640 have a working chronograph?
Quality automatic copies do, with start, stop, and reset via the two pushers, and the chronograph minutes counter tracks in the 12 o'clock subdial. Budget quartz copies sometimes print the subdials as decoration only. Ask the seller to confirm working chronograph function and request a short video of the hands moving.
Is the caseback engraving accurate on replica IW371640 watches?
Premium copies laser-engrave the reference number, movement calibre, and serial between the lugs and around the display back. Low-grade versions use shallow, uneven lettering that fades under magnification. Compare the spacing and font weight against reference photos of the genuine 3716 caseback before you commit.
Can a replica IW371640 take genuine IWC straps?
If the lug width is a true 20 mm and the spring bar holes sit at the correct depth, aftermarket and OEM-style straps fit without modification. Measure the lug gap with calipers when the watch arrives. A 19 mm or 21 mm gap is a sign the case was not built to original dimensions.
Quick buying checklist
- Confirm 41 mm case and 13.1 mm thickness with photos next to a ruler.
- Check subdial positions at 12 and 6, with no date window.
- Ask for movement details and a live chronograph video.
- Verify sapphire crystal with inner AR coating, not mineral glass.
- Inspect engraved caseback text and serial spacing.
- Confirm 20 mm lug width and buckle or clasp type.
- Buy from a seller offering returns and a movement warranty.