A fake IW371748 is a replica of the IWC Portugieser Chronograph reference IW371748, a 41 mm stainless steel chronograph with a blue dial and an in-house column-wheel movement. Most replicas reveal themselves in four places: the subdial spacing, the shape and length of the leaf hands, the finishing around the lugs, and the movement visible through the sapphire case back. Knowing what the genuine reference looks like makes those four checks quick and decisive.

What the IW371748 Actually Is

The reference belongs to IWC's Portugieser Chronograph family, a line the brand has revised across several generations. The current 3716 generation, according to IWC's published specifications, uses a 41 mm stainless steel case with a slim bezel, a two-register chronograph layout, and the calibre 69355, an automatic movement with a column-wheel chronograph mechanism. A sapphire display back shows the movement, which is unusual in this price bracket and matters when you judge a copy.

The dial follows the Portugieser formula: applied numerals, leaf-shaped hands, a printed rail-track minute scale, and running seconds at 6 o'clock balanced by elapsed chronograph minutes at 12. That symmetry is the single most photographed thing about the watch, which is exactly why replicas of it are so common and so easy to compare side by side.

Why This Reference Gets Copied

Demand drives it. The Portugieser Chronograph is one of IWC's best-known steel models, it photographs well, and it has a clean dial that factories can reproduce without solving anything complicated. There is no tourbillon to fake, no skeleton work, and no unusual case material. The challenge for a replica maker is the opposite: a simple dial leaves every small error on display, because there is nowhere to hide.

The Tells That Matter Most

  • Subdial spacing. On the genuine layout the two subdials sit at 12 and 6 with even margins. Many replicas drift, either crowding the center or leaving a gap that looks wrong in photos.
  • Hand shape. The leaf hands should be slim, symmetrically tapered, and reach the minute track. Replicas often use shorter or blunter hands with thicker tips.
  • Dial printing. Look at the brand wording, the numerals, and the rail track. Under magnification, replica printing tends to be slightly heavier or uneven at the edges.
  • Case and lug profile. The Portugieser case has a distinctive step and polished bevel. Poor copies soften that edge or polish it away.
  • Pushers and crown. Pusher travel should feel consistent and the crown should seat firmly. Loose or gritty pushers are a common weakness.
  • Crystal and coating. Genuine sapphire has a clear, slightly cool reflection. Cheap copies show a blue or purple tint or a wavy reflection.
  • Case back and engraving. Reference numbers, case numbers, and text should be crisp and aligned, not stamped shallow or doubled.

Movement Grades in Replica IW371748 Watches

Replica chronographs of this style generally fall into three groups. The cheapest use a quartz movement with faux subdials, which is easy to detect because the chronograph seconds tick once per second. Mid-tier copies frequently run a 7750-derived automatic chronograph, a proven and serviceable design but one that is thicker than the in-house calibre and often gives the case a taller profile. The top grade uses a decorated Chinese automatic chronograph with column-wheel styling, closer in look to the genuine calibre but still distinguishable by finish, engraving quality, and rotor design.

If you care about how the watch behaves rather than how it looks on a table, the automatic options are the only ones worth considering. A quartz copy will never match the sweep of a mechanical chronograph.

Strap, Buckle, and Case Back

Genuine Portugieser Chronographs typically ship on alligator or calf leather with a signed pin or folding buckle, and some versions on a steel bracelet. On replicas, check the stitching density, the leather grain, and the buckle engraving. A soft, plasticky strap with wide, uneven stitching is usually the first thing an experienced buyer notices, long before the dial.

Questions to Ask Before You Buy

  1. Which movement is inside, and is it mechanical or quartz?
  2. Are the photos of the actual piece or stock images?
  3. What is the case diameter and thickness as measured, not as listed?
  4. Is there any warranty or return window if the watch arrives damaged?
  5. Which strap and buckle are included?

Price Expectations and Honest Limits

Replica pricing tracks movement grade more than anything else. A quartz copy sits at the bottom, a 7750-based automatic sits in the middle, and a decorated column-wheel style copy sits at the top. Above a certain point you are paying for finishing and photography rather than accuracy. No replica of the IW371748 matches the tolerances, materials, or long-term serviceability of the genuine watch, and counterfeit goods rules differ from country to country, so it pays to understand the local position before you buy.

Used as a reference point, the real IW371748 gives you a benchmark: subdial spacing, hand length, lug geometry, and movement finish. Measure a replica against those four and you will know within a minute what you are looking at.