What IW376038 is
IW376038 is an IWC reference number. The prefix IW marks IWC Schaffhausen. The four digits after it, 3760, name the model family: the Aquatimer Chronograph, a dive watch with a stopwatch function. The last two digits, 38, name one variant of case, dial and strap inside that family.
IWC sells current models under new numbers and keeps older references in service records. The company does not run a public page for retired numbers. Check an IWC extract from the archives or a dated catalog before you treat any spec list as final.
Specs that apply to the 3760 series
- Case diameter: 44 mm
- Water resistance: 300 m on the rated model
- Crystal: sapphire, front
- Bezel: rotating dive bezel
- Calendar: day and date at 3 o'clock
- Chronograph: two or three registers, 12 hour totalizer
- Strap: rubber or steel bracelet, set by variant
Case material changes with the variant. Steel is common. Titanium appears on some versions. IWC does not confirm the exact material for this number in public records, so verify it against the case back.
Caliber
IWC used caliber 79320 in the Aquatimer Chronograph line. It is a chronograph module built on the ETA 7750. Figures: 25 jewels, 28,800 vibrations per hour, 44 hours of power reserve, automatic winding, cam switched chronograph, hacking seconds. The rate is 4 Hz, so the chronograph second hand steps eight times per second.
Replica versions from China
Factories in Guangzhou and Shenzhen build copies of the Aquatimer Chronograph. Two grades show up in listings.
- Budget grade: Asian 7750 clone, mineral or sapphire crystal, plated case, $150 to $250.
- Higher grade: clone or Swiss ETA 7750, 316L or 904L steel, sapphire with anti reflective coating, $350 to $600.
Points of difference to check: crown guards, date font, lume color, bezel action, case back engraving depth, rotor noise. Replica case backs are engraved, not struck, so edges look softer. Water resistance claims on replicas are not tested to 300 m. A pressure test costs little and settles the question.
Buying checks
- Read the reference off the case back and compare it to an IWC record.
- Measure the case. 44 mm is the series number. A 42 mm case is a different reference.
- Time the rate over 24 hours on a timegrapher. A serviced 7750 base should hold within +10 seconds a day.
- Ask for the serial number and the service history.
Legal facts for US buyers
Importing counterfeit goods into the United States is prohibited under 19 U.S.C. 1526. Trafficking in counterfeit goods carries criminal penalties under 18 U.S.C. 2320. Customs and Border Protection seizes shipments and destroys them. A buyer who orders one watch can lose the money and the item.
Price context
Pre-owned genuine Aquatimer Chronograph watches list in the low four figures. Box and papers add a premium. Replica listings sit between $150 and $600. A service on a genuine 79320 costs more than a high grade replica.