Short answer
IW371761 is a reference number used by replica sellers for an IWC Portugieser Chronograph. IWC's public catalogue does not document an IW371761, so treat the number as a seller label, not a factory reference. The watch it points to is the 41 mm Portugieser Chronograph: steel case, two subdials at 12 and 6, date at 3, in-house calibre 69355.
Buy the watch you can inspect, not the number in the listing title.
What the number means
IWC reference numbers for this line start with IW3716. The trailing digits mark dial color, case metal, and strap. Documented examples include IW371605, IW371604, and IW371609. A seller writing IW371761 may mean a specific dial variant, a boutique edition, or nothing at all. Ask for photos of the caseback engraving and the dial before you pay.
Genuine baseline specs
- Case: 41 mm diameter, 13.1 mm height
- Lug width: 20 mm
- Movement: calibre 69355, automatic, column wheel chronograph
- Power reserve: 46 hours
- Frequency: 28,800 vph (4 Hz)
- Water resistance: 30 m
- Crystal: domed sapphire, anti-reflective coating on both faces
- Caseback: sapphire display
- Subdials: chronograph minutes at 12, small seconds at 6
Any replica that deviates from these numbers is a different watch with a borrowed label. A 42 mm case or a 3-6-9 subdial layout is not this reference.
Parts to inspect
Dial and hands
- Applied Arabic numerals, thin and flat, not painted
- Leaf-shaped hands with a clean center ridge
- Print weight on the minute track, sharp edges, no bleeding
- Date window cut square, font narrow, no gap at the frame
Case and pushers
- Pusher travel should be short with a clear start and stop click
- Crown should seat flush, no gap against the case band
- Lug bevels should run the full length, not stop mid-lug
- Caseback engraving depth and font weight
Movement
Most replicas in this line use a modified Valjoux 7750 with transferred subdials or a clone of the 69355. Ask for a photo of the movement through the caseback. Look for a column wheel and a rotor engraving that matches the genuine pattern. A 7750-based build runs at 28,800 vph, so a timegrapher reading near that figure tells you nothing about origin.
Price bands
Listings for this model sit in three rough groups: about $150 to $250 for entry builds with a painted dial, $300 to $450 for mid builds with applied markers, and $500 to $800 for high-tier builds with a cloned movement and sapphire on both sides. These figures come from asking prices on replica sites, not from verified sales.
Limits you should accept
- Water resistance is not tested. Do not swim with it.
- No IWC service. Parts come from the seller.
- Resale value is close to zero.
- Accuracy of the number on the caseback proves nothing about the build.
Questions for the seller
- Case diameter and height in millimeters, measured
- Movement model and beat rate
- Lug width and strap material
- Photo of the dial at an angle, no studio lighting
- Return policy in writing