Core advice: buy the watch, not a copy of it. If the reference you want is IW371490, treat that number as the start of a hunt for a genuine IWC Portugieser Chronograph, and budget for the paperwork that proves it. Replica versions of this reference are easy to find, and none of them come with the things that make the watch worth owning: a serviceable chronograph movement, a case that holds its tolerances, a warranty, and resale value. This guide does not explain how to buy counterfeit goods. It explains how to shop the real reference, and where a legal lookalike makes more sense.
What the reference is
IW371490 belongs to the Portugieser Chronograph family, a line IWC has produced across several generations. Variants differ by dial color, case metal, strap and movement generation, so two watches that share most of a reference number can still be very different purchases. Before you compare listings, pull the exact variant and its published specifications from the manufacturer, then match every detail on the watch in front of you against that record.
What to check on a genuine example
- Case and lug finishing: edges should be crisp, with no softened polishing from a heavy-handed refinish.
- Dial printing: numerals, the railroad minute track and the branding should sit level and evenly weighted under magnification.
- Chronograph action: pushers should start, stop and reset with a firm, consistent click, and the reset hand should snap to zero.
- Papers and history: original box, warranty card, and service receipts matter more than any single cosmetic detail.
- Serial and reference: ask for clear, sharp photos, and have a watchmaker confirm the movement before money changes hands.
Spec bands to expect
- Case diameter: roughly 40 to 41 mm, which wears large because of the thin bezel.
- Movement: a chronograph calibre with roughly 40 to 46 hours of power reserve, automatic winding, and a display back on most variants.
- Crystal: sapphire on the front, sapphire or a solid case back depending on generation.
- Water resistance: modest, typically rated for splashes rather than swimming, and the rating only holds while the gaskets are fresh.
- Strap: alligator leather in most configurations, with steel bracelets on some references.
Confirm each figure against the manufacturer's own published data for your exact variant rather than trusting a marketplace description.
Why replicas fail the same tests
A counterfeit chronograph usually hides a generic movement with no parts supply, so a single worn component can turn it into a paperweight. Case finishing rarely survives close inspection, water resistance claims are untested, and the watch cannot be serviced by an authorized watchmaker. Add the legal side: counterfeit goods can be seized at import, and holding one gives you no recourse if it fails. Resale is close to zero.
Legal alternatives with a similar look
If the styling is what attracts you, several mid-tier and microbrand makers sell chronographs with a clean dial, a slim bezel and printed numerals. A pre-owned genuine watch from a smaller brand, or a lower reference within the same family, gets you real service support without the counterfeit problem.
FAQ
Is a replica of IW371490 a good deal?
No. You save on the purchase and lose on service, warranty, water resistance and resale.
How do I verify the reference?
Compare the number on the case back with the manufacturer's published specifications for that variant, and have an independent watchmaker open the case.
What ongoing costs should I plan for?
A mechanical chronograph needs service every several years. Ask for service history, and factor that recurring cost into your budget.