Prioritize case dimensions, dial printing, and a working automatic chronograph. The IW371601 is the IWC Portugieser Chronograph 150 Years edition, so a good replica should match its 41mm stainless steel case, white lacquered dial, blue printed numerals, and blue leaf hands. A reliable automatic chronograph movement matters more than a perfect logo. Check the subdials at 12 and 6 o'clock, the absence of a date window, and the quality of the blue alligator-grain strap.
What to Look For in a Replica IW371601
Start with the case. The original has a 41mm diameter, 13.1mm thickness, and a mix of polished and brushed stainless steel. The lugs should curve down for a comfortable fit. The dial should have a clean white lacquer finish with blue printed Arabic numerals and blue leaf-shaped hands. Two subdials sit at 12 and 6 o'clock: a 30-minute chronograph counter at 12 and small seconds at 6. There is no date window at 3 o'clock. The crystal should be sapphire with anti-reflective coating. Mineral glass is a clear downgrade.
The chronograph must work. Pushers should start, stop, and reset with a crisp click. Subdial hands should return to zero every time. The movement should be an automatic chronograph running at 28,800 vibrations per hour with a 40 to 50 hour power reserve. Common options include a clone of the Valjoux 7750 or a similar automatic chrono. Avoid quartz movements and cheap 21-jewel automatics. The strap should be blue alligator-grain leather with a 20mm lug width and a steel pin buckle. Stitching must be even and tight.
Parameter Bands That Matter
Use these ranges to judge a replica before you commit.
- Case diameter: 40.5mm to 41.5mm
- Case thickness: 12.8mm to 13.5mm
- Lug width: 20mm
- Watch head weight: 75g to 95g
- Movement frequency: 28,800 vph (4Hz)
- Power reserve: 40 to 50 hours
- Subdial positions: 12 and 6 o'clock
- Water resistance: do not trust beyond splashes
Common Pitfalls to Avoid
Many replicas fail on small details that are easy to spot once you know them.
- Quartz movement instead of automatic
- Non-working subdials or a frozen chronograph
- A date window at 3 o'clock where none should exist
- Wrong blue shade on hands and numerals (should look heat-blued, not flat navy)
- Blurry or crooked dial printing
- Case thickness over 14mm, which looks bulky
- Hollow feeling case or cheap strap that peels
- No anti-reflective coating on the crystal
- Misaligned subdial hands after reset
- Loose crown or pushers that wobble
FAQ
Is the IW371601 a limited edition?
Yes. The original IWC Portugieser Chronograph 150 Years is limited to 2000 pieces. Replicas are not limited, so do not pay a premium for a serial number claim.
Does a good replica have a working chronograph?
Yes. A quality first copy should have a fully functional chronograph with start, stop, and reset. Test the pushers and confirm the subdial hands move and reset to zero.
What movement should I expect?
A reliable automatic chronograph, often based on the Valjoux 7750 or a similar design. Avoid quartz and low-jewel automatics. The movement should feel smooth when winding and keep time within a few seconds per day.
Can I wear it swimming?
No. Replica watches rarely have proper gasket sealing. Keep it away from water, including showers and pools.