Quick answer
The replica IW371455 is a copy of the IWC Portugieser Chronograph from the 3714 reference family. Three things decide whether a copy is worth owning: the movement inside, the dial layout, and the case finishing. A usable replica runs a 7750-based automatic chronograph, keeps a 41 mm steel case with the correct lug width, and holds twin subdials at 12 and 6 with no date window. Copies that move the subdials or add a date are obvious from across a room.
Genuine specs to compare against
- Case: stainless steel, about 41 mm across, about 12.3 mm thick
- Movement: IWC calibre 79350, a reworked Valjoux 7750, 28,800 vph, about 44 hours of reserve
- Layout: 30-minute counter at 12, running seconds at 6, no date
- Crystal: domed sapphire with anti-reflective coating on both faces
- Water resistance: 30 m on the factory rating
- Strap: 20 mm lug width, leather strap, steel pin buckle
Any replica worth the money should match those numbers. Ask the seller for the measured case diameter, the lug width, and a photo of the movement. Vague answers mean a vague watch.
How replica versions differ
Movement
Copies come with a quartz module, a basic Chinese 7750 clone, or a clone with decorated bridges and an engraved rotor. The 7750 clone carries the same subdial geometry as the genuine 79350 base, so the dial stays honest. Quartz versions lose the sweeping chronograph hand and the pusher feel, and they are the easiest tell at a glance. Servicing on the clone is possible at most independent shops that work on Valjoux 7750 movements.
Case and crystal
Study the lug tips, the crown guards, and the transition between brushed and polished surfaces. Cheaper cases show soft edges and uneven brushing. On the crystal, sapphire with a blue or purple anti-reflective tint reads closer to the original than plain mineral glass.
Dial and hands
Look at the applied numerals, the feuille hands, and the depth of the subdial rings. Good printing stays crisp under a loupe, with clean spacing between the brand text and the model line. Flat subdials and fuzzy printing are the usual weak points.
How to check a replica IW371455 before you pay
- Confirm the case diameter with a photo of calipers across the case at 3 and 9 o'clock.
- Request a photo of the movement with the caseback removed.
- Ask for a macro shot of the dial and both subdials.
- Ask for a video of the chronograph starting, stopping, and resetting to zero.
- Test the crown action: two positions, smooth winding, no grinding.
- Verify the strap width at 20 mm and the shape of the pin buckle.
- Get the return window in writing before you send money.
- Pay with a method that offers buyer protection.
Price tiers
Budget copies sit around 80 to 150 USD and run quartz or a low-grade automatic. Mid tier copies run about 180 to 350 USD and use a 7750 clone with a decent dial. Top tier copies run about 350 to 600 USD with better case finishing, sapphire, and a decorated movement. Price swings with the dial variant and with bracelet options, so compare like for like.
Care and servicing
Treat the water resistance rating as decoration. Do not swim or shower with a replica, because gaskets are rarely tested at the factory. Stop the chronograph before you reset it, since resetting while running damages the mechanism on a 7750 base. Plan on a service every three to five years if you wear the watch daily.
Legal limits
US Customs and Border Protection can seize shipments of goods that carry counterfeit trademarks, with no refund to the buyer. Selling a replica as a genuine watch is a criminal offense. Keep the watch for personal wear, keep the receipt that labels it as a replica, and never pass it off in a sale.