Quick answer
IW376063 is an IWC reference number. It sits in the IW3760 block. IWC used that block for Aquatimer Chronograph Automatic watches. The watch is a 44 mm steel dive chronograph with an internal bezel, a day and date window, and a Valjoux 7750 base calibre.
Copies sold as replica IW376063 copy that layout. Most carry a 42 mm to 44 mm steel case, a mineral or sapphire crystal, and a quartz or Asian automatic movement. Two parts decide quality: the movement and the dial print. A quartz copy costs less and has a ticking seconds hand. A copy with an Asian 7750 clone costs more and runs a working chronograph with a sweep seconds hand.
The exact number does not appear on every IWC regional site. Family specs apply. Confirm the reference on a warranty card or dealer listing before you trust any spec sheet.
Specs of the IW3760 family
These figures come from IWC spec sheets and dealer listings for the 2009 Aquatimer Chronograph generation.
- Case: 44 mm stainless steel, about 15 mm thick
- Crystal: sapphire, antireflective coating on both sides
- Water resistance claim: 300 m
- Movement: calibre 79320, 25 jewels, 28,800 vph
- Power reserve: 44 hours
- Functions: hours, minutes, small seconds at 9, chronograph with 30 minute and 12 hour counters, day and date at 3
- Bezel: internal rotating bezel with a second crown at 2 o'clock
- Strap: rubber with a steel pin buckle
Movement types in copies
- Quartz: the low end. The seconds hand ticks once per second. Chronograph pushers may be decorative.
- Asian 7750 clone: automatic, sweep seconds, working chronograph. It adds 1 mm to 2 mm to case height.
- Seagull ST19: manual wind, used in some chronograph copies.
- Unknown no-name automatic: common on auction sites. No parts supply.
What to inspect before you buy
- Dial print. Check the IWC logo, the AUTOMATIC line, and the depth rating text. Crooked or thick letters point to a low grade print.
- Date window. The date should sit at 3 o'clock with numerals that match the dial color. Off-center date wheels are a common fault.
- Subdial spacing. The 12, 6, and 9 positions should sit on the same radius. A quartz copy has flatter subdials.
- Bezel action. The inner bezel should turn with the crown at 2 o'clock and hold position.
- Caseback. Check engraving depth and reference text. Cheap laser etch rubs off.
- Weight. A steel copy weighs 150 g to 190 g on the rubber strap. Under 120 g points to a hollow case or an alloy body.
- Lume. Ask the seller for a dark photo. Weak lume is the norm on cheap copies.
Water resistance
No replica carries a real 300 m rating. Gaskets in copies are thin and caseback threads are cut to a lower tolerance. Treat any copy as splash resistant. Take it off for swimming, showers, and dishes. If you want to wear it near water, ask a watchmaker to pressure test it first. Many will refuse to guarantee the result.
Price ranges
Copies of this reference run about $80 to $450. Quartz models sit at the low end. Automatic models with a 7750 clone and a sapphire crystal sit at the top. A price under $60 points to quartz and a mineral crystal in most cases. Genuine IWC Aquatimer Chronographs trade used in the low four figures. Check current listings before you compare.
Service and parts
An Asian 7750 clone needs service every 3 to 5 years. Many watchmakers in the US will not touch replica movements. Parts come from the same supply chain as the watch, so buy from a seller who stocks spares. A quartz copy needs a battery swap every 2 to 3 years and nothing else.