A replica IW371628 is a copy of IWC's 41 mm Portugieser Chronograph in stainless steel, with two sub-dials stacked on the vertical axis and leaf-shaped hands. The best copies get the case profile, dial printing, and movement layout close to the original. The weak ones show up in thickness, sub-dial spacing, and the finish on the caseback.
What the replica IW371628 is copying
The reference sits in IWC's Portugieser Chronograph line, a watch built around a wide dial and a slim bezel. The genuine version uses a 41 mm steel case, a domed sapphire crystal, applied numerals, and a leather strap. Replica makers target that same silhouette, which is why the model is popular: the dial is large and readable, so any misalignment in the printing or the sub-dials is easy to spot in photos.
Because the design is simple, small errors matter more than they do on a busy dive watch. A crooked marker or a slightly heavy date font stands out right away.
Movement options in a replica IW371628
- Quartz chronograph: lowest cost, thin case, but the sub-dial hands step instead of sweeping and the pushers feel hollow.
- Asian automatic with a 7750 base: a common mid-tier option that has a real chronograph mechanism but adds thickness.
- Decorated automatic clone: the top tier, with rotor engraving, perlage, and blue screws meant to echo a Swiss chronograph caliber.
Movement choice drives case thickness, and thickness is the first thing collectors compare against the original dimensions. An automatic copy can sit a millimeter or two deeper than the genuine watch, and that shows under a shirt cuff.
Dial and case details that separate tiers
Dial
- Sub-dial spacing and diameter: the two counters should mirror each other and sit on the vertical axis.
- Printing: the brand text and the minute track should be sharp, not fuzzy or doubled.
- Applied numerals: polished edges, correct shape, no glue visible around the base.
- Hands: leaf shape, correct length, and a smooth sweep on mechanical versions.
- Crystal: clear sapphire or mineral with a light anti-reflective tint, not a blue haze.
Case and caseback
- Lug shape and curve, which decide how the watch sits on the wrist.
- Crown size and pusher spacing, both easy to compare in side-by-side photos.
- Brushing and polishing: crisp transitions, no rounded edges from over-polishing.
- Engraving on the caseback: depth and font weight, not a shallow laser etch.
- Water resistance: treat any replica as splash resistant at most unless it has been pressure tested.
QC checklist before a replica IW371628 ships
- Ask for photos of the dial straight on, then at an angle, in daylight.
- Check the date window alignment if that version has a date.
- Confirm the chronograph starts, stops, and resets to zero.
- Look at the caseback engraving and the rotor decoration.
- Check the strap stitching and the buckle finish.
- Ask for a timegrapher reading if the movement is mechanical.
- Confirm total thickness and lug width against the original specs.
Price tiers and what to expect
Cost tracks the movement and the factory tier, not the reference name. A quartz copy costs a fraction of a well-finished automatic with a decorated chronograph movement, and the gap shows in the dial details and the feel of the pushers. Buyers who want the closest match to the original usually pick the automatic version and accept a slightly thicker case.
Sizing matters too. The 41 mm case wears large on small wrists because the dial takes up most of the front and the bezel is thin. Check your wrist size before ordering, and remember that a leather strap can be swapped without touching the case.
FAQ
Is a replica IW371628 a good first copy?
Yes, if you like clean dress chronographs. The dial is simple, so a good copy looks convincing, and the leather strap works with both business and casual outfits.
How can I tell a good copy from a bad one?
Compare thickness, sub-dial position, and printing. Those three points catch most of the difference, even in low-resolution photos.