Short answer
IW376077 is an IWC reference in the Aquatimer chronograph family. Replica versions of this reference are less common than Rolex Submariner or Omega Seamaster copies. Most listings sold under this number use a 44 mm steel case, an Asian 7750 chronograph movement or a quartz movement, and a rubber or steel strap. Price bands run from about $100 for quartz builds to about $450 for automatic chronograph builds. Genuine IW376077 examples list for about $4,000 to $6,500 pre-owned.
The reference
The 3760 group covers IWC Aquatimer chronographs. IWC fits most models in this group with calibre 79320, a Valjoux 7750 base with 25 jewels, 28,800 vph, and a 44 hour power reserve. Case width is 44 mm. Water resistance is rated 300 m on the diver models. Confirm the exact variant against an IWC reference page or a printed catalog, because the 3760 group carries several dial and bezel versions and IW376077 is not documented in every index.
What replica versions exist
Two build types appear in this market. The first is a quartz chronograph. The second is an automatic with a Chinese-made 7750 clone. The automatic build costs more and adds a chronograph with a seconds hand that sweeps at 8 beats per second. High-end super clone Aquatimer replicas are rare. Most sellers who list IW376077 stock a mid-tier automatic.
Case, bezel and dial
Replica cases measure 44 mm wide and about 15 mm thick in most listings. Check bezel action. The genuine bezel ratchets with defined clicks and aligns at 12 o'clock. Replica bezels turn with less resistance or stop short of alignment. Dial print is the second check. The IWC and Schaffhausen text should be sharp, level, and spaced even. Replica dials show heavy print and a date window that sits off-center.
Crystal, strap and finish
Genuine models use sapphire with anti-reflective coating on both faces. Replicas use mineral glass, or sapphire with coating on one face. This changes how the dial reads under light. Check the strap. Genuine rubber straps carry a molded IWC mark on the underside and a signed buckle. Replicas ship with unsigned hardware or a generic deployant clasp.
Water resistance
Do not swim with a replica. The 300 m rating on a genuine Aquatimer comes from tested gaskets, a screw-down crown, and a case back built to spec. Replica cases pass no pressure test. Water enters at the crown tube and the case back gasket. Any seller who claims a tested 300 m rating on a replica makes a claim that cannot be verified.
Price bands
- Quartz, rubber or steel strap: $100 to $180
- Automatic 7750 clone, rubber strap: $220 to $350
- Automatic with sapphire and steel bracelet: $300 to $450
- Genuine IW376077, pre-owned: about $4,000 to $6,500 with condition, box, and papers as the main variables
Checks before you buy
- Ask for a case back photo. The reference number is engraved on the genuine, not printed.
- Ask for video of the chronograph start, stop, and reset. Pushers should snap back.
- Ask for a timed run. An automatic clone should hold within 20 seconds a day.
- Watch the date change. It should flip at midnight, not drift across an hour.
- Get return terms in writing before payment.
What is not known
IWC does not publish IW376077 on every reference page. Some indexes place the number in the Aquatimer 2000 group instead. Verify the number against a dealer invoice or a printed catalog before you treat any listing as accurate. Replica sellers reuse reference numbers, so a listing can carry IW376077 and ship a different case shape, dial layout, or movement.