Short answer
IW376057 is an IWC reference number for an Aquatimer chronograph. Replica versions sell in three tiers: quartz builds near $80 to $150, Asian automatic chronographs near $200 to $400, and super clone builds near $450 to $700. The genuine watch is a 44 mm steel dive chronograph with a day-date window, a rotating dive bezel, and an automatic chronograph movement. Copies match the case shape and the dial layout. They do not match the movement, the case finishing, or the water resistance rating.
IWC reference numbers use the form IW plus six digits. The first digits group the model family and the case. The last digits mark dial, bezel, and edition. IWC changes dial color, bezel insert, and strap between variants that share one case, so confirm the exact edition on IWC's site or with a boutique before you compare a copy against photos.
What the genuine reference is
- Case: stainless steel, about 44 mm across, about 15 mm thick.
- Crystal: domed sapphire with anti-reflective coating on both faces.
- Movement: IWC caliber 79320, an automatic chronograph with a 44 hour power reserve, 28,800 vibrations per hour, and a day-date at 3 o'clock.
- Bezel: external bezel coupled to an inner dive scale, which IWC calls the SafeDive system.
- Water resistance: rated to 300 m on Aquatimer chronograph models.
- Strap: rubber or steel bracelet, depending on the variant.
These numbers describe the dive chronograph line as a whole. IWC's own catalog page is the authority on which dial, bezel, and edition IW376057 carries.
What the replica tiers deliver
Quartz tier, $80 to $150: stamped case, mineral glass, printed dial, and a quartz module with a working chronograph. The second hand ticks in one second steps.
Automatic tier, $200 to $400: an Asian 7750 clone, sapphire or coated mineral glass, and a screw-down crown. The chronograph works. The day and date work. The date font and the rotor engraving differ from the original.
Super clone tier, $450 to $700: a closer 7750 clone with engraved rotor, applied markers, anti-reflective sapphire, and a bracelet with tighter end link fit. Case thickness is the common failure point.
Checks before you buy
- Case size. Ask for caliper photos. The genuine watch reads 44.0 to 44.3 mm. Copies often run 42 mm or 46 mm.
- Bezel action. On the real watch the outer bezel turns the inner dive scale. Many copies have a fixed outer bezel and a separate inner ring turned by a crown.
- Day and date. Both should flip together near midnight and sit centered in the window with no gap at the top.
- Crown and pushers. Screw-down crown with clean threads. Two pushers with firm travel and no side play.
- Dial print. Compare the weight of the brand text and the line under it. Copies print thin letters or use the wrong typeface.
- Water resistance. No replica ships with a pressure test certificate. Treat the rating as zero.
Cost and legality in the United States
Prices above are street prices from replica sellers and they move with movement supply. In the United States, trafficking in counterfeit goods is a federal offense under 18 U.S.C. 2320. Customs and Border Protection can seize counterfeit watches at import. A single watch for personal use carries less exposure than resale. The item stays subject to seizure, and selling copies carries criminal penalties.
Bottom line
A replica IW376057 copies the look of a 44 mm dive chronograph. It does not copy caliber 79320, the case finishing, or the 300 m rating. Judge a copy on case diameter, bezel coupling, date alignment, and dial print. Buy from a seller who shows caliper photos and a movement photo, and assume the watch is not waterproof.