Quick answer
Replica IW371643 watches copy the IWC Portugieser Chronograph 41. The genuine watch has a 41 mm stainless steel case, 13.1 mm height, sapphire crystal, sapphire caseback, and IWC calibre 69355 with 46 hours of power reserve. Replicas sell from about $60 to $800. The cheap end uses quartz and mineral glass. The top end uses an automatic 7750 clone and sapphire. No replica carries an IWC movement.
What the genuine IW371643 is
IWC builds the Portugieser Chronograph 41 in stainless steel at 41 mm across and 13.1 mm thick. The dial carries two subdials: chronograph minutes at 12 and running seconds at 6. Hands are feuille shaped. Numerals are applied. Water resistance is rated at 3 bar. The strap is alligator leather on a steel pin buckle.
Calibre 69355 is an automatic chronograph with 46 hours of reserve and 28,800 vibrations per hour. The display caseback shows the movement, the rotor, and the engraving.
Third party catalogs do not list every dial and strap combination tied to each reference number. Confirm dial color, hands, and strap on the IWC product page for IW371643 before you compare a replica photo.
Where replicas differ
- Case height. Many replicas measure 14 to 15.5 mm against 13.1 mm on the genuine watch.
- Crystal. Mineral glass under $150. Sapphire above $200. Some sellers claim sapphire and ship glass.
- Movement. Quartz, Seagull ST19 hand wound at 21,600 vph, or a 7750 clone at 28,800 vph.
- Dial. Subdial rings are printed, not recessed. Pad printing is thicker. Blue dials read flat under light.
- Caseback. Display glass on most copies, but the finishing under it does not match IWC.
- Strap. Stamped synthetic leather at low prices. Real leather at high prices.
- Case weight. Steel heads on replicas run lighter than the genuine head.
Price tiers
$60 to $150: quartz movement, mineral glass, basic case finishing. $180 to $380: automatic 7750 clone, sapphire crystal, display caseback. $400 to $800: better dial printing, closer case profile, higher grade strap. Sellers use terms such as AAA, 1:1, and super clone. The terms are marketing. Ask for caliper measurements and movement photos instead.
Checks before you buy
- Ask for case diameter and thickness measured with calipers.
- Ask for a video of the chronograph start, stop, and reset.
- Check subdial alignment at 12 and 6, plus the date aperture if the reference has one.
- Get the crystal material in writing.
- Ask for the movement name and beat rate. 28,800 vph points to an automatic 7750 type. 21,600 vph points to a Seagull ST19.
- Ask for photos of the caseback and rotor engraving.
- Read the return terms. Customs seizures are not covered by most sellers.
Water resistance and service
A 3 bar rating on a replica is a claim, not a test result. ISO 22810 defines how water resistance is measured. Copies do not pass that test. Do not swim or shower with one. Gaskets dry out and crack. A 7750 clone service at an independent watchmaker runs $80 to $150 plus parts.
Legal note
Replica watches copy protected trademarks and design. US Customs and Border Protection seizes counterfeit shipments. A seized order means lost money and no replacement.