Short answer
IW376071 is an IWC reference number. The IW3767 block covers the Aquatimer Chronograph, a 44 mm steel dive watch. Replica sellers list IW376071 as a copy of that model with a Valjoux 7750 style movement. The exact dial color, strap code and case finish for IW376071 could not be verified from public IWC material. Ask for a caseback photo before you send money.
Model facts behind the reference
IWC used the IW3767 number for the Aquatimer Chronograph in the late 2000s and early 2010s. Numbers tied to that generation:
- Case width: 44 mm.
- Case height: about 15 mm.
- Water resistance: 120 m on the 2009 generation. Later Aquatimer chronographs moved to 300 m.
- Movement: calibre 79320, a modified Valjoux 7750.
- Rate: 28,800 vibrations per hour, 25 jewels, about 44 hours of reserve.
- Layout: small seconds at 9, 30 minute counter at 12, 12 hour counter at 6, day and date at 3.
- Case metal: steel in most versions. Titanium and bronze appear elsewhere in the Aquatimer line.
IWC no longer lists this block as a current model. Pre-owned genuine examples trade on the secondary market at prices set by condition, box, papers and service history.
What runs inside a copy
Most replicas of this reference carry a Chinese clone of the 7750. That movement is a known design with known weak points. Two things matter at purchase:
- Does the chronograph start, stop and reset to zero at 12?
- Does the day and date change clean over at midnight?
A small group of sellers use a quartz movement instead. A quartz copy shows a ticking seconds hand at 9 and no winding feel at the crown. That difference changes the value by a wide margin.
Inspection points
- Bezel: the inner rotating ring should turn with the crown at 4 and hold position.
- Crystal: sapphire on the original. Mineral glass scratches and shows a bevel at the edge.
- Dial print: check letter spacing and the position of the logo under 12.
- Lume: charge the dial under a lamp and compare glow time.
- Strap: rubber straps on copies harden and crack within a year in most cases.
- Weight: a steel 44 mm chronograph feels heavy. Light weight points to a plated or hollow case.
None of these checks prove originality. Replica makers copy casebacks, boxes and papers.
Price markers
Chronograph copies in this class sell for roughly USD 150 to USD 600. The spread tracks the movement, the crystal and the finish on the case sides. Resale value for any replica is near zero. IWC does not service counterfeit watches, and IWC service centers will not supply parts for them.
Legal position in the United States
Counterfeit watches are illegal to import and sell in the US. 19 U.S.C. 1526 covers importation and 18 U.S.C. 2320 covers trafficking. CBP can seize a shipment, and the buyer has no refund path. Trademark law in the US protects the IWC name and the Aquatimer marks.
Verification steps
- Write down the full reference and search a live listing for the genuine model.
- Compare caseback engraving, movement photos and dial print against those images.
- Check the seller return policy in writing.
- Check the import rules for your country before ordering.
Data on the IW376071 variant itself stays thin. Treat any claim from a seller as unverified until you see photos of the actual unit.