A first copy IW371498 is worth buying only when the seller shows macro photos of the dial, the caseback, and the movement, and answers direct questions about the caliber inside. This reference belongs to the IWC Portugieser Chronograph line, so the visual signature is a vertical two register dial, applied numerals, and a slim steel case. Most disappointment with these watches comes from two things: a dial that looks right at arm's length and wrong under a loupe, and a movement no watchmaker will touch. Settle both before you pay.

What the Watch Should Look Like

The Portugieser Chronograph uses two subdials stacked on the vertical axis, a 30 minute counter at 12 and running seconds at 6, with no date window. A date aperture means you are looking at a different watch or a mixed build. Case diameter sits near 41 mm, thickness around 13 mm, lug width 20 mm. The bezel is thin, the lugs curve down, and the crystal is domed. Confirm the exact variant first, because this reference exists in more than one dial and strap combination, and a seller who mixes up dial colors is a seller who mixed up parts.

What to Check Before Paying

• Dial printing. Look for sharp, evenly weighted text. Blurry or thick brand lettering is the first giveaway.
• Subdial spacing. The two registers should sit on the same vertical line, with equal gaps to the center and to the outer track.
• Hand length. Chronograph and seconds hands should reach the minute track, not stop short of it.
• Applied numerals. They should sit flat, with consistent polish and clean edges. Crooked or glued numerals lift at one corner.
• Case finishing. Brushed flanks and polished bevels should meet on a crisp line, not a rounded smear.
• Pushers and crown. Start, stop, and reset should give a firm click and snap back to zero in one motion.
• Caseback engraving. Depth and font weight matter. Laser etched text looks shallow and grey next to stamped text.
• Strap and clasp. Stitching should be straight and tight, the leather grain should not look printed, and the clasp should close with a solid sound.

Parameter Bands

• Case: 40.5 to 41.2 mm diameter, 12.5 to 13.5 mm thick, 20 mm lugs.
• Weight: 75 to 95 g on leather, 135 to 160 g on a steel bracelet. A watch that feels hollow has a thin case.
• Crystal: domed sapphire front. Mineral glass scratches and shows a different curve.
• Movement: automatic chronograph, 28,800 vibrations per hour, 40 to 68 hours of power reserve. Ask for the caliber number and a photo of the rotor.
• Water resistance: 3 bar on the genuine piece. Treat any higher claim on a replica as marketing and keep it away from water.

Pitfalls

• Listing photos lifted from the manufacturer. Reverse image search them.
• No movement photo, no return policy, or payment only by irreversible transfer.
• Swiss made as a headline claim with no movement details behind it.
• Glare heavy photos that hide subdial alignment and dial printing.
• Customs seizure. Importing counterfeit goods is illegal in the United States, and packages can be seized and destroyed.
• Service refusal. Brand service centers will not touch a replica, so budget for an independent watchmaker for anything mechanical.

FAQ

Will a first copy IW371498 keep good time?

A well regulated automatic chronograph can hold within a few seconds a day. Poorly finished movements drift more and are harder to regulate.

Can a local watchmaker service it?

Many independents will, as long as the parts are standard. Ask before you buy, and confirm the movement family so the shop can source seals and gaskets.

Does 41 mm wear large?

On a wrist under 6.5 inches the lugs can overhang. Measure your wrist and compare the lug to lug distance, not just the diameter.

Why does the watch look worse in person?

Dial printing, hand finishing, and crystal clarity are the details that photograph well and feel cheap up close. Ask for a daylight video before committing.