Buy the replica IW371772 on movement and case geometry first, and on cosmetics second. A Portugieser chronograph copy stands or falls on three things: the subdial layout, the case profile, and the chronograph movement inside. A seller who shows sharp photos of the caseback, the crown side, and both subdials is showing you the parts that separate a watch you keep from one you resell within a month. Ask for those photos before you ask about anything else, including finish options.
What to Check Before You Commit
The Portugieser line has a clean, thin look that cheap copies destroy in predictable ways. Work through this list in order.
- Subdial spacing. The two registers should sit inside the dial with even margins. Copies built on a stock 7750 base often crowd the subdials toward the center because the movement plate is thicker than the original.
- Case thickness. A thin dress chronograph is the whole point. If a listing shows a case that looks slab-sided in profile shots, the movement stack is wrong.
- Dial printing. Look at the numerals and the minute track under magnification. Blurry edges and uneven blue or silver finish are the first things to fail.
- Crystal and coating. Good sapphire with an inner anti-reflective coating reads almost invisible at an angle. Plain mineral glass throws a gray haze across the dial.
- Lug fit and strap. Gaps between the strap and the lugs mean the case was milled from a generic blank rather than shaped for this reference.
Spec Bands Worth Accepting or Refusing
Numbers keep you honest when photos look good. These bands cover most builds sold as this reference.
- Case diameter: 40.5 mm to 41.5 mm. Anything below 40 mm or above 42 mm reads wrong on the wrist and on the dial.
- Case thickness: 12.5 mm to 13.5 mm. Over 14 mm is a red flag for a stock chronograph module.
- Lug width: 20 mm. A 22 mm strap on a 40 mm case looks oversized and is a common shortcut.
- Water resistance: treat any claim above 50 m as marketing unless the caseback gasket and crown seals are shown.
- Crystal: sapphire, domed slightly, with coating on the inner surface where possible.
Movement Options and What They Change
Three broad tiers show up in this model. A basic Asian automatic chronograph keeps the price low but adds thickness and a stiff pusher feel. A modified 7750-based automatic runs smoother and supports a wider range of dial layouts, though it still adds roughly a millimeter over the original profile. A slim automatic chronograph with a modular layout gets closest to the original proportions and is the tier worth paying for if the case measurements back it up. Ask which base the movement uses and how thick the finished case is. Vague answers on either point usually mean the seller does not know.
Pitfalls That Show Up After Delivery
- Subdials that do not reset to zero cleanly. Test the chronograph function in the first hour.
- Pushers that feel gritty or stick halfway. This points to a dry or poorly finished movement.
- Strap stitching that pulls loose at the lug end within weeks.
- Water ingress after hand washing because the caseback was sealed with a thin gasket.
- Color shift on gold-toned cases, which wear through to the base metal at the crown and lugs.
Questions Buyers Ask
How close is the case size to the original?
A well-built copy sits within a millimeter of the original diameter and thickness. Ask for caliper photos rather than a stated number, since measurements in listings are often copied from the genuine reference.
Is a Swiss movement worth the premium in this model?
Only if the case is built to match it. A Swiss-grade movement inside a thick, poorly finished case wastes the upgrade. Fix the case first, then the movement.
What should I inspect on arrival?
Check the chronograph start, stop, and reset cycle, the crown threads, the subdial alignment, and the lug-to-strap fit. Photograph anything wrong before you wear the watch.
How do I judge seller photos?
Look for natural light, a straight-on dial shot, a true profile shot, and a clear caseback image. Sellers who only post angled glamour shots are hiding the profile and the movement.