Short answer
Replica IW371734 listings are counterfeit versions of an IWC Pilot's Watch Chronograph in the 3717 family. Genuine 3717 watches use a 42 mm steel case, an ETA 7750 base caliber, and a day-date window at 3 o'clock. Replica versions copy the outside shell and swap in a low-grade or clone chronograph movement. IWC will not service them.
Reference facts
IWC ran the 3717 Pilot's Watch Chronograph from 2006 to 2012. The case measures 42 mm across and about 14.7 mm thick. Water resistance is 60 m. The crystal is sapphire with an anti-reflective coating on both faces. A soft-iron inner case shields the movement from magnetic fields. The crown screws down. The dial has three registers: running seconds at 9, chronograph minutes at 12, chronograph hours at 6. Day and date sit at 3. Hands and numerals carry Super-LumiNova. Later variants changed strap, dial color, and case finish. IWC does not publish a full historic reference archive, so confirm the number stamped on the caseback of any example you inspect.
Movement
The genuine caliber 79320 is a modified ETA 7750. It beats at 28,800 vibrations per hour, has 25 jewels, and runs about 44 hours on a full wind. Replicas use one of three movements: an Asian 7750 clone, a Shanghai 7750, or a quartz module. The Asian 7750 keeps the same register layout and chronograph action. Quartz versions lose the sweep of the chronograph seconds hand and the rotor does not turn.
What separates a good copy from a bad one
Case thickness is the first tell. A real 3717 sits at 14.7 mm. Many replicas measure 15.5 mm to 16 mm because the clone movement is thicker and the caseback is cut deeper. Other checks:
- Day-date font and the window position at 3 o'clock
- Subdial hand length and the printed scale inside each register
- Caseback engraving depth and the reference number
- Lume brightness 30 minutes after light exposure
- Crown thread feel and pusher resistance
- Sapphire coating, which shows a blue or purple tint on replicas
Price
Replica IW371734 listings run from about $180 to $550. Below $200 the movement is a 21-jewel Asian 7750 with a stamped rotor. Above $400 sellers claim Swiss parts, which in most cases means a Swiss mainspring or balance wheel inside an Asian kit. Genuine 3717 watches trade used for $4,000 to $7,500 depending on box, papers, and condition.
Legal and ownership facts
US Customs can seize counterfeit watches. CBP reports thousands of watch seizures each year, and a shipment can be destroyed with no compensation. Selling a counterfeit that carries a copied trademark is a federal offense under 18 U.S.C. 2320. The trademark on the dial belongs to IWC, so a replica cannot be imported for resale.
Service is the practical problem. IWC will not repair or authenticate a counterfeit. Independent watchmakers in the US often decline replica work because parts are not standardized. A replacement clone movement costs $60 to $120 and a swap takes a few days.
Resale value is close to zero. There is no secondary market price for a used replica beyond the value of the parts inside it.