A replica IW371759 is a third-party copy of an IWC Portugieser Chronograph reference, a two-register chronograph with a wide, clean dial and a slim bezel. The strongest copies match the case silhouette, subdial spacing, and dial printing, while cheap versions miss those three points. This guide covers what the reference looks like, which movements turn up inside copies, and how to judge a listing before you pay.
What the IW371759 Reference Looks Like
The reference belongs to the Portugieser Chronograph family, a line built around dressy proportions, a round stainless steel case, and a dial that leaves plenty of open space. Typical traits of the family include:
- A round case with a thin, polished bezel and lugs that curve toward the wrist
- A two-register layout, with one subdial near 12 o'clock and one near 6 o'clock
- Applied numerals or baton markers, plus leaf-shaped hands
- A domed or flat sapphire crystal with anti-reflective treatment
- A leather strap, often with a pin buckle or a deployant clasp
IWC has released several dial colors and strap combinations inside this reference family, so confirm the exact configuration in the seller's own photos rather than trusting a model name alone.
What Good Copies Get Right
Quality on a replica IW371759 shows up in small details that are easy to compare side by side with reference photos.
- Case finish: the mix of brushed and polished surfaces should follow the original, with crisp edges where the two meet
- Subdial spacing: the gap between the two registers and the center of the dial should look balanced, not crowded
- Dial printing: text should be thin and sharp, with even spacing and no blurring at the edges
- Applied markers: indices should sit flat and level, with clean polishing on the facets
- Pushers and crown: the shape, size, and engraving on the crown are frequent weak points
Movement Options Inside Copies
Three movement types appear in replica IW371759 listings, and each one changes how the watch feels on the wrist.
Quartz
Quartz copies are the cheapest option. The chronograph subdial often steps once per second instead of sweeping, and the case is usually thinner and lighter than the original. They work as a visual stand-in, not as a mechanical watch.
Asian Automatic Chronograph
Most mid-range copies use an automatic chronograph movement based on a common Valjoux-style architecture. These give a sweeping seconds hand and a working chronograph, but the module adds thickness. Measure the case thickness if the seller lists it, because extra depth is the easiest flaw to spot.
Cloned or Decorated Movements
Higher-tier copies use movements built to resemble the original calibre, with engraved bridges and rotor decoration. They run closer to the original thickness and often hold better finishing under the caseback. Ask for a clear photo of the movement and the caseback engraving before buying.
Case, Crystal, and Dial Checks
If you can handle the watch before buying, run through this list:
- Measure the case diameter and thickness with calipers and compare to the reference figure.
- Start the chronograph and let it run for a minute, then reset it and confirm the hand returns to zero.
- Look at the crystal at an angle to check for anti-reflective coating and any haze.
- Inspect the subdial hands for height and alignment against the dial surface.
- Check the date window, if fitted, for centering and clean cut edges.
Strap, Clasp, and Caseback
Strap quality is a quick signal of overall build. Look for even stitching, a consistent edge finish, and a buckle or clasp with engraving that matches the caseback style. On the caseback, check that reference numbers and text are laser-crisp rather than shallow or smudged. A soft, thin strap on an otherwise solid copy is common, and it is one of the cheapest parts to replace.
Price Tiers and What They Buy
- Entry tier: quartz movement, plated case, mineral glass, basic strap
- Mid tier: automatic chronograph, stainless steel case, sapphire crystal, decent dial print
- Top tier: cloned movement with decoration, closer case thickness, refined finishing, better strap and clasp
Prices move with movement type, case material, and crystal, so compare several listings at the same spec level rather than chasing the lowest number on the page.
Red Flags in a Listing
- Only manufacturer stock images, with no photos of the actual watch
- No movement photo and no case thickness listed
- Claims that a copy is built in the same factory or from the same parts as the original
- No return window or a policy that excludes mechanical issues
- A price far below other listings with the same stated specs
Sizing and Wearability
Portugieser Chronograph cases sit in the low 40 mm range with a fairly wide dial opening, which makes them wear larger than the number suggests. If your wrist is under about 6.5 inches, check lug-to-lug length before choosing a copy with a thicker automatic movement, since added case depth pushes the watch higher off the wrist. A 20 mm strap is common on this family, and swapping to a thinner leather strap can improve how the watch sits.
Questions to Ask a Seller
- What movement is inside, and can you send a photo of it?
- What is the exact case diameter and thickness?
- Is the crystal sapphire or mineral glass?
- Are the photos of the specific watch I will receive?
- What happens if the chronograph does not reset to zero?
Working through these checks takes a few minutes and separates a replica IW371759 that looks right on the wrist from one that only looks right in a listing photo.