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The Portugieser Chronograph uses a Valjoux 7750-based movement with added column wheel; the sub-register layout and slim case profile are the primary authentication anchors.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| dial | Sub-register positions (7750 layout) | 30-minute chronograph counter at 12 o'clock; running seconds sub-register at 6 o'clock; no sub-register at 3 or 9; silver or black dial with railway-track minute chapter ring | Running seconds at 3 and 30-minute counter at 9 (standard 7750 layout, indicating non-IWC-modified movement); any sub-register at 9 on the claimed IW371446 |
| crystal | Domed sapphire crystal profile | Pronounced dome visible in profile; blue anti-reflective coating; dome height matches the slim case; IWC logo etching on crystal at 6 visible under polarized light | Flat crystal indicating replacement; absent or mismatched AR coating; no IWC crystal etching; crystal that sits below the case bezel level |
| movement | Cal. 79350 column wheel via caseback | Valjoux 7750 architecture with IWC column-wheel modification visible; "IWC" signed rotor; "Cal. 79350" text; 44-hour power reserve; column wheel at correct position | Standard cam-lever 7750 without column wheel (indicating a non-IWC-modified movement); "IWC" absent on rotor; Cal. 79350 text absent |
| case | Slim case proportions and pusher feel | 41mm diameter; slim profile (approximately 13mm thick); two pushers at 2 and 4 snap crisply; lug shape consistent with Portugieser family; screw-down caseback | Case thickness over 14mm; spongy pushers; lug shape inconsistent with Portugieser profile; case diameter outside 40.5-41.5mm |
| dial | IWC font and text quality | "IWC SCHAFFHAUSEN" at 12 in correct serif font; "PORTUGIESER" text below; sub-register text at correct size and weight; Arabic numeral 6 replaced by 6 o'clock sub-register | Incorrect font weight; "SCHAFFHAUSEN" absent or misspelled; sub-register text that does not match the dial color family |
The IW371446 Portugieser Chronograph uses a silver dial with a Valjoux 7750-based Cal. 79320. The 40.9mm case has the characteristic thin lugs and thin bezel of the Portugieser family. The Portugieser is the most replicated IWC line; dial printing quality is the first inspection point.