The IWC Portugieser Chronograph IW371497 is a 41 mm steel watch with a blue dial, twin sub-registers at 12 and 6, and the in-house 69355 caliber. A replica of this reference can look convincing in photos and fall apart in the hand. The gap between a low-tier fake and a top-tier build shows up in four places: case thickness, dial print, sub-dial spacing, and the engravings on the back. Check those four first, then work through the rest of this list.
Reference Specs to Match
- Case: 41 mm stainless steel, 13.1 mm thick, 20 mm lug width
- Crystal: box-shaped sapphire with anti-reflective coating on both faces
- Dial: blue with applied numerals and a printed railroad minute track
- Sub-dials: 30-minute counter at 12, small seconds at 6
- Movement: IWC 69355, automatic, 46-hour power reserve
- Strap: alligator leather or steel bracelet depending on the variant
Step-by-Step Inspection
- Measure the case with calipers. Anything past 13.5 mm is a 7750 case with a spacer, not a match for the 69355 architecture.
- Check sub-dial positions. On the genuine dial the two counters sit inside the inner chapter and are spaced 180 degrees apart. Many replicas drift the upper counter toward the center.
- Look at the date window at 3. Genuine print is crisp and level. Replicas show a magnifier lip and off-center numerals.
- Turn the crown. A smooth wind with a defined click points to a decent 7750 clone. Grit points to a cheap movement.
- Start the chronograph and watch the seconds hand. Reset should snap to 12 with no overshoot.
- Flip the watch and read the caseback. Genuine engraving is laser-cut with sharp edges. Replicas use shallow stamping.
- Weigh it. Genuine steel on a strap runs near 80 grams. A replica under 65 grams uses a thinner case body.
- Test the crystal. Tap a fingernail on the edge. Sapphire rings flat and hard. Mineral glass sounds dull.
Movement Reality Check
No replica of this reference carries an IWC 69355. The best builds use a modified Valjoux 7750 or a Chinese clone of it, with a decorated rotor and a printed jewel count. That is fine for looks, but expect the sub-dial layout to differ from the genuine watch. The 69355 uses a column wheel and vertical clutch. A 7750 uses a cam and horizontal clutch. If a seller claims a column wheel replica, treat that as marketing copy.
iw371497 fake watch alternative
Red Flags
- Stock photos with no macro shots of the dial print
- Claims of a Swiss movement at a low price
- No return window and no photo of the actual unit
- Thickness listed as same as genuine with no number attached
Before You Buy
Ask for a video of the chronograph running, a photo of the caseback engraving, and the measured thickness. A seller who refuses any of the three is not worth the risk. Keep in mind that selling or importing counterfeit goods is illegal in the United States, and customs can seize a shipment. A replica is a costume piece, not an investment, and it carries no factory service and no resale value.