Short Answer
A replica IW371776 is a copy of the IWC Portugieser Chronograph in stainless steel. The good ones reproduce the 41 mm case, the two-register dial with subdials stacked at 12 and 6, the leaf hands, the domed sapphire crystal, and the display caseback. The poor ones fail on hand length, dial print weight, bezel thickness, and engraving depth. Judge a replica against the genuine reference, never against another replica, because the second watch may be wrong in the same way.
Before You Start
- A digital caliper that reads to 0.01 mm
- A 10x jeweler's loupe
- High-resolution photos of the genuine reference from the front, side, back, and at an angle
- Bright directional light, not overhead room light
- Awareness of the counterfeit rules in your own country, since ownership and import rules differ
How to Inspect a Replica IW371776
- Measure the case across the bezel at 3 and 9 o'clock with the caliper. The genuine case sits near 41 mm, so a reading below 40.5 mm or above 41.5 mm is a mismatch.
- Measure case thickness from the caseback to the top of the crystal. Anything over about 13.5 mm usually means a cheap movement spacer was used.
- Measure lug to lug and the gap between the lugs at the spring bar. The strap width on this reference is 20 mm, and a 21 mm or 19 mm gap is a clear error.
- Study the subdial placement. Both registers sit on the vertical axis at 12 and 6, and their outer rings should sit close to the dial edge without touching the printed minute track.
- Compare the hand lengths against your reference photos. The leaf hands should reach the minute track, and the subdial hands should stop just short of their own markers.
- Inspect the dial printing with the loupe. Check the IWC mark, the Schaffhausen line, and the chronograph text for the correct font weight and even letter spacing.
- Check whether the hour markers are applied metal or flat print. Look at the side profile under angled light to confirm the markers sit above the dial surface.
- Turn the watch over and read the caseback. The reference number, the serial, and the case material text should be cut into the metal at an even depth, not etched pale and shallow.
- Press each chronograph pusher. Start, stop, and reset should each give one clean click, and the reset should snap the subdial hand back to zero without a stutter.
- Run the chronograph for ten minutes, then stop it and watch the subdial hand hold position. Drift while stopped points to a loose hand or a worn friction spring.
- Set the watch and leave it for 24 hours against a known clock. Note the rate error before you decide the movement is acceptable.
- Examine the strap and buckle. Check the grain, the stitch pitch, and the buckle engraving, then test fitment by sliding a 20 mm spring bar into the lug holes.
Common Red Flags
- Subdials placed at 3 and 9 instead of 12 and 6
- Painted markers on a reference that uses applied markers
- A date aperture that sits off center or uses the wrong numeral font
- Gritty or mushy pushers with a soft reset
- Caseback text that disappears when you tilt the watch toward the light
- A crystal with heavy edge distortion or a visible blue or purple AR tint on the dial side
What a Replica Cannot Match
Finishing standards and service support separate a copy from the original. The genuine watch carries a column-wheel chronograph movement regulated to a tight daily rate and backed by a manufacturer service network with original parts. A replica uses a mass-produced movement, and no authorized service center will touch it. Water resistance testing is also unverifiable, so treat any replica as splash resistant at best and keep it out of pools and showers.
Legal Note
The IWC name, logo, and reference numbers are protected trademarks. Selling a replica as genuine, or importing one into countries that ban counterfeit goods, can lead to seizure, fines, or worse. If you buy one, keep it for personal use and disclose what it is in any resale discussion.