Answer first
IW545167 is an IWC reference number written in the format IW plus six digits. The first four digits name the model family. The last two digits name the version inside that family. I found no confirmed IWC model with the exact number IW545167 in public catalogs. The string appears on replica listings and on gray-market pages. Verify the number with IWC or an authorized dealer before you pay.
What the number means
IWC writes references as IW5451 67 on some paperwork and as IW545167 on the caseback and warranty card. A six-digit string with no matching entry in the IWC catalog is a warning sign. Replica sellers reuse real family numbers and add invented version digits.
Case and dimensions
Measure the case with calipers. Do not measure by eye. Replica cases run 0.5 mm to 1.5 mm wide of spec and sit thicker on the wrist. Check lug width, 20 mm or 22 mm on most Portugieser-style cases. Check lug-to-lug against the published figure. A 1 mm error changes how the watch sits on the arm.
Crystal and dial
Genuine IWC sapphire carries anti-reflective coating on both faces. The dial reads black from most angles with little reflection. Many replicas coat one face, so the glass throws a blue or purple flare under a lamp. Check printed text under 10x magnification. Replica dials show soft edges, uneven spacing, and thick serifs on the logo. Applied indices on a genuine dial sit flush and take a sharp polish.
Movement
Ask for a photo of the movement with the caseback off, or a video of the balance in motion. IWC finishes plates with Geneva stripes, circular graining, and blued screws. Replica movements use stock Asian calibers with engraved plates or decals. Count the beats. A 28,800 vph balance beats 8 times per second. A 21,600 vph balance beats 6 times per second. A 10-second video shows the difference.
Caseback, serial, and papers
A genuine caseback carries the reference, a serial number, "International Watch Co.", "Schaffhausen", and "Swiss Made". Check that the serial on the caseback matches the warranty card and the IWC service record. Replica serials repeat across batches. Ask the seller for the sales receipt and the service history.
Price signals
An IWC Portugieser in steel trades in the four and five figure range. A listing at three figures, or a "new" watch at 10 percent of retail, is a replica. A seller who refuses an in-person inspection, escrow, or a return window is the second signal.
Before you buy
- Match the reference against the IWC catalog or an authorized dealer.
- Ask for macro photos of dial, caseback, crown, and movement.
- Meet a watchmaker and open the caseback.
- Compare the serial against IWC service records.
- Pay through escrow with a return window.